user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: who was the leader of the us during wwii? 
Knowledge Triplets: World War II, base.skosbase.vocabulary_equivalent_topic.narrower_concept, World War, 1939-1945--Hostages
American Theater, time.event.included_in_event, World War II
m.010_09yn, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.0b46p4g
Lyndon B. Johnson, military.military_person.participated_in_conflicts, World War II
World War II, time.event.instance_of_recurring_event, World war
m.011r9l78, military.force_strength.military_conflict, World War II
1940s, time.event.includes_event, World War II
m.09y5hqr, common.webpage.topic, World War II
m.09yvl19, common.webpage.resource, Stephen King on J.D. Salinger: 'The last of the great post-WWII American writers'
Tadeusz Bór-Komorowski, military.military_person.participated_in_conflicts, World War I
World War II, common.topic.webpage, m.09xgynp
World War II, common.topic.webpage, m.09y9l5w
m.09y2gbs, common.webpage.topic, World War II
Charles de Gaulle, military.military_person.participated_in_conflicts, World War I
m.02h7nrd, military.casualties.military_conflict, World War II
m.09ysx61, common.webpage.topic, World War II
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.exhibition_types, Photography exhibition
World War II montage image, common.image.appears_in_topic_gallery, World War II
Action of 6 October 1944, time.event.included_in_event, World War II
m.09ygfz9, common.webpage.resource, Remembering Robert S. McNamara through 'The Fog of War'
World War II, military.military_conflict.casualties, m.02h7nqf
World War II, base.morelaw.war.peace_treaty, Nuremberg Charter
World War II, common.topic.webpage, m.09yggz2
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Dwight D. Eisenhower
m.02h77t6, military.military_command.military_commander, Lyndon B. Johnson
World War II, common.topic.notable_types, Military Conflict
Dwight D. Eisenhower, military.military_commander.military_commands, m.04h_hmh
m.0b475k_, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.04jx14r
m.0478pm4, military.military_command.military_conflict, World War II
m.0y7_lvp, military.military_command.military_conflict, World War II
m.04g9ysp, military.military_combatant_group.conflict, World War II
m.02h7npb, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.0cqm322
World War II, common.topic.webpage, m.0b475k_
World War II, common.topic.webpage, m.09wsxxn
World War II, exhibitions.exhibition_subject.exhibitions_created_about_this_subject, Living with the Dead: W. Eugene Smith and World War II
m.09y9l5w, common.webpage.topic, World War II
m.09y6kxc, common.webpage.topic, World War II
m.09yf8lh, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09ys_2c
m.04g9ywq, military.military_combatant_group.conflict, World War II
World War II, common.topic.webpage, m.0b49czw
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rpn5h
World War II, military.military_conflict.casualties, m.043wps7
m.09x4cx1, common.webpage.topic, World War II
m.059b7cc, military.military_command.military_conflict, World War II
m.04h_hmh, military.military_command.military_commander, Dwight D. Eisenhower
World War II, common.topic.webpage, m.09xyz9p
World War II, military.military_conflict.combatants, m.04g9ysp
m.09wgp4k, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09w41xr
World War II, base.morelaw.war.peace_treaty, Franco-Polish alliance
m.05rnk1w, event.speech_or_presentation.speech_topic, World War II
World War II, common.topic.image, m.02923_6
m.02h7nn7, military.military_command.military_conflict, World War II
m.02923_6, common.image.appears_in_topic_gallery, Allies of World War II
World War II, radio.radio_subject.programs_with_this_subject, Lost Innocence: The Children of World War II
World War II, tv.tv_subject.tv_programs, Anne Frank: The Whole Story
Harry S. Truman, military.military_person.participated_in_conflicts, World War I
m.02h7nqp, military.casualties.military_conflict, World War II
United States Navy operations during World War I, time.event.locations, Mediterranean Sea
Great Patriotic War, time.event.included_in_event, World War II
World War II, common.topic.webpage, m.09wxv0j
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, Vietnam War
m.05rln07, event.speech_or_presentation.speech_topic, World War II
World War II, military.military_conflict.commanders, m.0w5q83x
m.0w5t9rt, military.military_command.military_conflict, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rpn5h
Josip Broz Tito, military.military_person.participated_in_conflicts, World War I
World War II, time.event.locations, Europe
Living with the Dead: W. Eugene Smith and World War II, common.topic.image, freebase ex dead.jpg
D-Day: 40 Years Later, radio.radio_program.subjects, World War II
m.09y4ljx, common.webpage.topic, World War II
World War II, base.morelaw.war.peace_treaty, Tripartite Pact
World War II, common.topic.webpage, m.09yf8lh
m.02h7nq3, military.casualties.military_conflict, World War II
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.venues, m.04lmk01
m.04h_hmh, military.military_command.military_conflict, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rnk1w
World War II, military.military_conflict.commanders, m.02h77t6
P-38 can opener, base.argumentmaps.original_idea.discovered_during_event, World War II
m.09xss79, common.webpage.topic, World War II
World War II, common.topic.webpage, m.0b46rff
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Benito Mussolini
Living with the Dead: W. Eugene Smith and World War II, common.topic.article, m.04lmj_t
m.09wxv0j, common.webpage.topic, World War II
m.09ygg0r, common.webpage.resource, Remembering Robert S. McNamara through 'The Fog of War'
m.043wpsh, military.casualties.military_conflict, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Charles de Gaulle
m.0b46rff, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.010_09yn
World War II, common.topic.webpage, m.09wgp7j
World War II, military.military_conflict.commanders, m.02h7nn7
World War II, common.topic.webpage, m.09yvl19
m.04lmj_d, common.webpage.topic, Living with the Dead: W. Eugene Smith and World War II
m.02h7np1, military.military_command.military_conflict, World War II
m.0w5q2sz, military.military_command.military_conflict, World War II
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09y4ljx
World War II, military.military_conflict.commanders, m.02h7nnj
World War II, base.jewlib.jewish_studies_field.collections, Holocaust Era Assets
Maurice Gamelin, military.military_person.participated_in_conflicts, World War I
World War II, base.morelaw.war.peace_treaty, Treaty of San Francisco
My Grandma Fritzi, Movie Star, or How a Muslim King Saved Jews in World War II (Essay), common.resource.annotations, m.0b475k_
m.02h7nmz, military.military_command.military_conflict, World War II
m.0b48g2t, common.webpage.topic, World War II
World War II, common.topic.article, m.081q5
World War, 1939-1945--Hostages, base.skosbase.skos_concept.broader_topic, World War II
World War II, common.topic.webpage, m.09wl5j0
World War II, common.topic.webpage, m.09xwgl8
m.0w5qcxy, military.military_command.military_conflict, World War II
m.0w5vmcb, military.military_command.military_conflict, World War II
m.09wsrnl, common.webpage.topic, World War II
World War II, military.military_conflict.casualties, m.02h7npm
m.09x773p, common.webpage.topic, World War II
World War II, military.military_conflict.combatants, m.04g9ywq
Carl Gustaf Emil Mannerheim, military.military_person.participated_in_conflicts, World War II
Living with the Dead: W. Eugene Smith and World War II, common.topic.notable_for, g.125fv4np3
m.05rpn5h, event.speech_or_presentation.speech_topic, World War II
m.02h7nq3, military.casualties.combatant, Allies of World War II
World War II, military.military_conflict.commanders, m.0w5qcxy
World War II, military.military_conflict.force_strengths, m.011r9l78
World War II, time.event.locations, Middle East
World War II, base.argumentmaps.discovery.original_idea, P-38 can opener
Władysław Sikorski, military.military_person.participated_in_conflicts, World War II
Allies of World War II, military.military_combatant.casualties, m.02h7npm
World War II, base.morelaw.war.peace_treaty, Pact of Steel
World War II, common.topic.webpage, m.09ybsfr
World War II, common.topic.webpage, m.09xr1l4
m.063vhkn, base.nobelprizes.nobel_honor.subject_area, World War II
Allies of World War II, military.military_combatant.includes_allies, United States of America
World War II, time.event.locations, Southeast Asia
World War II, common.topic.webpage, m.09xq5z0
World War II, common.topic.webpage, m.09yjnz5
World War II, military.military_conflict.commanders, m.02h7nmf
World War II, base.morelaw.war.peace_treaty, Franco-Soviet Treaty of Mutual Assistance
Maurice Gamelin, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09xrmvz
Allies of World War II, military.military_combatant.casualties, m.02h7npw
World War II, base.morelaw.war.peace_treaty, Treaty of Peace with Italy, 1947
World War II, base.jewlib.jewish_studies_field.collections, German War Crime Records
m.05rmf82, event.speech_or_presentation.speech_topic, World War II
World War II, common.topic.notable_for, g.125500wpl
m.0cqm322, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5r8rm
World War II, base.nobelprizes.nobel_subject_area.nobel_awards, m.063vhkn
World War II, common.topic.webpage, m.09x4cx1
World War II, common.topic.subject_of, Text and Meaning in Albert Camus' The Myth of Sisyphus
m.09wwvtm, common.webpage.topic, World War II
Hellcat, the F6F in World War II, book.written_work.subjects, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Archibald Wavell, 1st Earl Wavell
m.0b45zcq, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.010nmtv6
World War II, military.military_conflict.commanders, m.0w5vmcb
Charles de Gaulle, military.military_person.participated_in_conflicts, World War II
m.0w5sb93, military.military_command.military_conflict, World War II
World War II, military.military_conflict.commanders, m.059b7cc
m.05rln07, event.speech_or_presentation.speaker_s, Franklin D. Roosevelt
World War II, military.military_conflict.commanders, m.02h7nmz
m.09wl5j0, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09x_3c3
United States Navy operations during World War I, time.event.locations, Atlantic Ocean
World War II, time.event.locations, Scandinavia
World War II, military.military_conflict.commanders, m.0w5t225
World War II, common.topic.webpage, m.0b48dsf
Władysław Anders, military.military_person.participated_in_conflicts, World War I
World War II, common.topic.webpage, m.09y6kxc
m.09x_3c3, common.webpage.topic, World War II
World War II, time.event.locations, Pacific Ocean
World War II, base.morelaw.war.peace_treaty, Anglo-Soviet Agreement
World War II, common.topic.webpage, m.09x7jp_
World War II, radio.radio_subject.programs_with_this_subject, D-Day: 40 Years Later
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rln07
World War II, common.topic.webpage, m.09wwvtm
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Josip Broz Tito
World War II, military.military_conflict.commanders, m.0w5s7wq
World War II, common.topic.webpage, m.09y2gbs
World War II, common.topic.image, WW2Montage
World War II, base.schemastaging.context_name.pronunciation, g.125_qbg06
Josip Broz Tito, military.military_person.participated_in_conflicts, World War II
Winston Churchill, military.military_person.participated_in_conflicts, World War I
United States Navy operations during World War I, time.event.locations, Pacific Ocean
World War II, common.topic.webpage, m.09ydx3t
Carl Gustaf Emil Mannerheim, military.military_person.participated_in_conflicts, World War I
m.043wps7, military.casualties.military_conflict, World War II
World War II, time.event.included_in_event, 20th century
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rm8xf
m.02923_6, common.image.appears_in_topic_gallery, World War II
Benito Mussolini, military.military_person.participated_in_conflicts, World War II
World War II, base.jewlib.jewish_studies_field.collections, Mauthausen Death Books
World War II, common.topic.subject_of, May 10-1940 Germany Invades Holland!
m.04lmk01, exhibitions.exhibition_run.exhibition, Living with the Dead: W. Eugene Smith and World War II
m.09x7jp_, common.webpage.topic, World War II
m.09xr1l4, common.webpage.topic, World War II
World War II, common.topic.subject_of, The Price of the Victory
World War II, time.event.locations, Asia
World War II, base.jewlib.jewish_studies_field.collections, Papers of the International Military Tribunal and the Nuremberg Military Tribunals
m.09yfzdj, common.webpage.topic, World War II
World War II, military.military_conflict.casualties, m.043wpsh
m.09ygg0r, common.webpage.topic, World War II
m.02h77t6, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09y8d_t
m.09yjnz5, common.webpage.topic, World War II
World War II, common.topic.image, World War II montage image
World War II, common.topic.webpage, m.09w7nt9
m.04jx14r, military.military_command.military_conflict, World War II
m.02h7nqf, military.casualties.military_conflict, World War II
World War II, common.topic.webpage, m.09y5hqr
m.09xwgl8, common.webpage.topic, World War II
m.09yybjl, common.webpage.topic, World War II
Hellcat, the F6F in World War II, book.written_work.subjects, 20th century
World War II, common.topic.webpage, m.09wsrnl
Adolf Hitler, military.military_person.participated_in_conflicts, World War I
World War II, military.military_conflict.commanders, m.0w5q2sz
m.02h7nnj, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09x5b2d
m.09w7qyh, common.webpage.topic, World War II
m.0b46p4g, common.webpage.topic, World War II
Archibald Wavell, 1st Earl Wavell, military.military_person.participated_in_conflicts, World War I
World War II, common.topic.webpage, m.09yj2jt
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.subjects, World War II
m.0w5r8rm, military.military_command.military_conflict, World War II
United States Navy operations during World War I, base.culturalevent.event.entity_involved, United States of America
m.05rpn5h, event.speech_or_presentation.speaker_s, Harry S. Truman
m.09wsxxn, common.webpage.topic, World War II
m.05rmrf2, event.speech_or_presentation.speech_topic, World War II
World War II, base.jewlib.jewish_studies_field.collections, Footnote.com - Holocaust Collection
Allies of World War II, common.topic.image, m.02923_6
World War II, military.military_conflict.commanders, m.02h7np1
m.09yj2jt, common.webpage.topic, World War II
m.05rmlhb, event.speech_or_presentation.speech_topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmrf2
Franklin D. Roosevelt, government.us_president.vice_president, Harry S. Truman
Allies of World War II, military.military_combatant.casualties, m.02h7nq3
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rln07
m.0w5q8n_, military.military_command.military_conflict, World War II
m.05rm8xf, event.speech_or_presentation.speech_topic, World War II
World War II, book.periodical_subject.periodicals, The War Illustrated
World War II, military.military_conflict.commanders, m.0y7_lvp
m.09xgynp, common.webpage.topic, World War II
m.09xyz9p, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09y0608
m.09yggz2, common.webpage.topic, World War II
m.09yvl19, common.webpage.topic, World War II
World War II montage image, common.image.size, m.02dts2j
m.04jx14r, military.military_commander.military_commands, Harry S. Truman
May 10-1940 Germany Invades Holland!, common.topic.subjects, World War II
World War II, common.topic.webpage, m.0b48g2t
m.09wgp7j, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmlhb
Living with the Dead: W. Eugene Smith and World War II, common.topic.webpage, m.04lmj_d
m.09w9d_p, common.webpage.topic, World War II
m.0w5s7wq, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09xss79
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmf82
United States Navy operations during World War I, time.event.included_in_event, World War I
World War II, military.military_conflict.commanders, m.0w5t9rt
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War I
Remembering Robert S. McNamara through 'The Fog of War', common.resource.annotations, m.09ygg0r
World War II, base.jewlib.jewish_studies_field.collections, Captured German Records
m.0w5q83x, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09xxnlt
m.02h7npm, military.casualties.combatant, Allies of World War II
m.09y0608, common.webpage.topic, World War II
m.02h7npw, military.casualties.combatant, Allies of World War II
Does Quentin Tarantino have the right to rewrite World War II?, common.resource.annotations, m.09wgp7j
World War II, common.topic.webpage, m.0b49cc7
World War II montage image, common.image.appears_in_topic_gallery, 1940s
George S. Patton, military.military_person.participated_in_conflicts, World War II
United Kingdom, military.military_combatant.belongs_to_combatant_group, Allies of World War II
Action of 23 April 1945, time.event.included_in_event, World War II
World War II, common.topic.webpage, m.09yfzdj
m.09ydx3t, common.webpage.topic, World War II
Archibald Wavell, 1st Earl Wavell, military.military_person.participated_in_conflicts, World War II
m.09xxnlt, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5q8n_
Stephen King on J.D. Salinger: 'The last of the great post-WWII American writers', common.resource.annotations, m.09yvl19
m.09w41xr, common.webpage.topic, World War II
Action of 10 November 1944, time.event.included_in_event, World War II
World War II, common.topic.webpage, m.09ysx61
m.02h7nmz, military.military_command.military_commander, Winston Churchill
m.09ys_2c, common.webpage.topic, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Adolf Hitler
World War II, base.jewlib.jewish_studies_field.collections, National Archives - Digital Holocaust Records
World War II, common.topic.webpage, m.09w7qyh
m.09ybsfr, common.webpage.topic, World War II
World War II, base.morelaw.war.peace_treaty, Atlantic Charter
World War II, common.topic.webpage, m.09w9d_p
Action of 5 July 1942, time.event.included_in_event, World War II
World War II, military.military_conflict.casualties, m.02h7nrd
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.subjects, W. Eugene Smith
m.02h7nns, military.military_command.military_conflict, World War II
American Theater, base.culturalevent.event.entity_involved, Allies of World War II
World War II, common.topic.webpage, m.0b6rtrx
Allies of World War II, military.military_combatant.includes_allies, Soviet Union
World War II, military.military_conflict.commanders, m.0w5sb93
m.0w5t225, military.military_command.military_conflict, World War II
m.09wwp1v, common.webpage.topic, World War II
m.0b48dsf, common.webpage.topic, World War II
Lost Innocence: The Children of World War II, broadcast.content.artist, Timothy Findlay
m.09xq5z0, common.webpage.topic, World War II
Władysław Anders, military.military_person.participated_in_conflicts, World War II
Benito Mussolini, military.military_person.participated_in_conflicts, World War I
World War II, time.event.included_in_event, 1940s
World War II, common.topic.webpage, m.09x773p
World War II, base.morelaw.war.peace_treaty, Sino-American Cooperative Organization
World War II, military.military_conflict.commanders, m.02h7npb
WW2Montage, common.image.appears_in_topic_gallery, World War II
m.09y8d_t, common.webpage.topic, World War II
m.09w7nt9, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09wgp4k
Living with the Dead: W. Eugene Smith and World War II, common.topic.notable_types, Exhibition
m.010nmtv6, event.speech_or_presentation.speech_topic, World War II
Remembering Robert S. McNamara through 'The Fog of War', common.resource.annotations, m.09ygfz9
Edward Rydz-Śmigły, military.military_person.participated_in_conflicts, World War II
m.09xrmvz, common.webpage.topic, World War II
Allies of World War II, military.military_combatant.includes_allies, Russia
World War II, base.morelaw.war.peace_treaty, Treaty of Vis
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Joseph Stalin
United States Navy operations during World War I, common.topic.notable_types, Military Conflict
World War II, time.event.locations, Atlantic Ocean
World War II, radio.radio_subject.programs_with_this_subject, The Army Hour
Adolf Hitler, military.military_commander.military_commands, m.02h7nns
The War Illustrated, book.periodical.subjects, World War II
Tadeusz Bór-Komorowski, military.military_person.participated_in_conflicts, World War II
World War II, military.military_conflict.casualties, m.02h7nqp
World War II, military.military_command.military_conflict, m.04jx14r
World War II, common.topic.webpage, m.09ygg0r
Allies of World War II, military.military_combatant.includes_allies, United Kingdom
m.09x5b2d, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.04h_hmh
World War II, military.military_conflict.casualties, m.02h7nq3
World War II, base.ontologies.ontology_instance.equivalent_instances, m.09klnbh
World War II, tv.tv_subject.tv_programs, Band of Brothers
World War II, military.military_conflict.commanders, m.0478pm4
Gerald Ford, military.military_person.participated_in_conflicts, World War II
m.0b49czw, common.webpage.topic, World War II
Edward Rydz-Śmigły, military.military_person.participated_in_conflicts, World War I
World War II, base.morelaw.war.peace_treaty, Paris Peace Treaties, 1947
m.0b49cc7, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09wwp1v
World War II, base.morelaw.war.peace_treaty, Armistice of Cassibile
Chiang Kai-shek, military.military_person.participated_in_conflicts, World War II
World War II, military.military_conflict.casualties, m.02h7npw
World War II, common.topic.webpage, m.0b45zcq
World War II, common.topic.webpage, m.09yybjl
United States of America, military.military_combatant.belongs_to_combatant_group, Allies of World War II
m.02h7nmf, military.military_command.military_conflict, World War II
World War II, military.military_conflict.commanders, m.02h7nns
1940s, common.topic.image, World War II montage image
m.0b6rtrx, common.webpage.topic, World War II
m.02h7nns, military.military_command.military_commander, Adolf Hitler
Lyndon B. Johnson, military.military_commander.military_commands, m.02h77t6

Answer: Franklin D. Roosevelt
Harry S. Truman