In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

Q: Washington (CNN) -- President Barack Obama used a Memorial Day ceremony to say it is time for America to properly welcome home Vietnam veterans and show them and their families the respect and gratitude they deserved but didn't receive decades ago. "You came home and sometimes were denigrated when you should have been celebrated," Obama said beneath a scorching sun at the Vietnam Veterans Memorial. "It was a national shame, a disgrace that should have never happened. That's why here today, we resolve that it will not happen again." The event, which launched a 13-year Vietnam War 50th anniversary commemoration, was the culmination of a day of somber events on the annual holiday honoring America's war dead.NEW: President Obama calls the denigration of Vietnam veterans a "national shame""America will be there for you," Obama tells veterans and their familiesMemorial Day launches a 13-year commemoration of the Vietnam War's 50th anniversaryObama lays a wreath to the fallen at Arlington National Cemetery 
 Question:This year marks the 50th anniversary of the _ deploying a significant military presence in Vietnam.

A: America
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Q: Havana, Cuba (CNN) Hurricane Irma, which devastated much of the Caribbean in September, has claimed a new victim: Raul Castro's succession plans. On Thursday, Cuban officials said the island was still dealing with the aftermath of the killer storm and needed to postpone long-held plans for Castro, 86, to retire on February 24, 2018, when his second five-year term ends. It was to have been the first time that Cuba was ruled by a leader not named Castro since the 1959 revolution that swept Raul Castro's older brother Fidel Castro to power. The wrath of Irma, however, delayed the Communist-run island's single party elections process, which appoints the Cuban National Assembly that in turn selects Cuba's president.Cuba, dealing with Hurricane Irma aftermath, says Castro will retire in April instead of FebruaryCastro has indicated first Vice President Miguel-Diaz Canel has his blessing to be the next president 
 Question:"My second and last term will have concluded," _ told Cuban lawmakers on Thursday, "and Cuba will have a new president."

A: Raul Castro
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Q: Dylann Roof, the man arrested after a shooting dead nine people in an historically black South Carolina church on Wednesday, wanted to start a civil war and bring back segregation, friends claim. The 21-year-old is pictured on his Facebook profile wearing a jacket bearing flags from apartheid-era South Africa and what was once white-rule Rhodesia. He also has a criminal record and in April received a gun for his 21st birthday. Since his arrest in North Carolina, 250 miles north of the targeted church, friends have spoken out to paint a picture of a demonic character who fantasized about massacres so openly that people thought he was joking.Dylann Roof, of Columbia, South Carolina, had recently been given a .45-caliber gun by his father as a 21st birthday presentRoof's Facebook profile photo shows him wearing a jacket with flags of apartheid South Africa and white-rule Rhodesia sewn onHis black Hyundai has a novelty plate of the Confederate statesA massive manhunt ended 250 miles away in Shelby, NC where Roof was arrested shortly before noon on ThursdayIn the months leading up to the shooting, Roof worked in the landscaping business and lived near a Lexington-area trailer park, friends saidBetween 4th and 9th grade he attended six schools, and repeated 9th grade 
 Question:The _ were was an unrecognized coalition of states between 1861 and 1865.

A:
Confederate
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