Question: Which documentary, The World Without US or Year at Danger, explores what might happen if the United States were to leave the international arena?

Context paragraphs:
Year at Danger: Year at Danger is a 2007 independent documentary.  Nine days after getting married, Steve Metze found out he was being deployed as part of Operation Iraqi Freedom.  Metze, a West Point graduate, Desert Storm veteran, and documentary filmmaker, decided to pack a camera and document his year in Iraq.  The film consists of footage shot by Metze during his deployment to Iraq and was edited by Don Swaynos.

The World Without Us: The World Without Us is a non-fiction book about what would happen to the natural and built environment if humans suddenly disappeared, written by American journalist Alan Weisman and published by St. Martin's Thomas Dunne Books.  It is a book-length expansion of Weisman's own February 2005 "Discover" article "Earth Without People".  Written largely as a thought experiment, it outlines, for example, how cities and houses would deteriorate, how long man-made artifacts would last, and how remaining lifeforms would evolve.  Weisman concludes that residential neighborhoods would become forests within 500 years, and that radioactive waste, bronze statues, plastics, and Mount Rushmore would be among the longest-lasting evidence of human presence on Earth.

1917 State of the Union Address: The 1917 State of the Union Address was given by Woodrow Wilson, the 28th President of the United States on Tuesday, December 4, 1917, during his turbulent second term.  He spoke in the United States House of Representatives chamber, in the United States Capitol.  He said, "I shall not go back to debate the causes of the war.  The intolerable wrongs done and planned against us by the sinister masters of Germany have long since become too grossly obvious and odious to every true American to need to be rehearsed."  He addressed the 65th United States Congress, and spoke of World War I.  He ended with, "A supreme moment of history has come.  The eyes of the people have been opened and they see.  The hand of God is laid upon the nations.  He will show them favor, I devoutly believe, only if they rise to the clear heights of His own justice and mercy."  In the middle of the speech, he said this about the German Empire, "The worst that can happen to the detriment the German people is this, that if they should still, after the war is over, continue to be obliged to live under ambitious and intriguing masters interested to disturb the peace of the world, men or classes of men whom the other peoples of the world could not trust, it might be impossible to admit them to the partnership of nations which must henceforth guarantee the world's peace."  He is saying that empires' do not promote world peace.  A year after he gave this speech, on December 4, 1918, the United States military would swallow Germany in victory, and the saying that is written would come true, "Death has been swallowed up in victory."

The World Without US: The World Without US is a documentary film created by Mitch Anderson and Jason J. Tomaric.  Released in 2008, the documentary explores what might happen if the United States were to leave the international arena, rescind its global reach and become an isolationist nation for the first time since the early 20th century.

L. L. Zamenhof: Ludwik Lejzer Zamenhof (Polish: "Ludwik Łazarz Zamenhof" , 15 December [O.S. 3 December] 1859 –14 April [O.S. 1 April] 1917 ), usually credited as L. L. Zamenhof, was a Polish-Jewish medical doctor, inventor, and writer.  He is most widely known for creating Esperanto, the most successful constructed language in the world.  He grew up fascinated by the idea of a world without war and believed that this could happen with the help of a new international auxiliary language, which he first developed in 1873 while still in school.

Mitch Anderson (director): Mitch Anderson is a Romanian-born American film director, producer, writer, researcher and editor.  He is the only son of former political dissidents of the Stalinist era.  His first film, "The World Without US", explores what might happen if the United States were to leave the international arena, rescind its global reach and return to being a non-interventionist nation.

United States national arena soccer team: The United States national arena soccer team is the Indoor soccer team that represents the United States at international competitions.  It is affiliated with Confederación Panamericana de Minifutbol (CPM) and the World Minifootball Federation (WMF).  The first international arena match played by the U.S. National Arena Soccer Team was in July 2008 in Montreal, Canada where Mexico defeated the United States 6–4.  The first international arena soccer match in the United States was held in July 2009 at NYTEX Sports Centre in North Richland Hills, Texas.  The United States won the inaugural WMF World Cup in 2015 after going undefeated in group play defeating Germany and Romania in the knockout rounds en route to the final and prevailing over Mexico 5–3 in the final.  Goalkeeper Danny Waltman was named tournament MVP.  The team will also be participating in the 2017 WMF World Cup to be held in Tunisia.

If This Goes On—: "If This Goes On—" is a science fiction novella by American writer Robert A. Heinlein, first serialized in 1940 in "Astounding Science-Fiction" and revised and expanded for inclusion in the 1953 collection "Revolt in 2100".  The novella shows what might happen to Christianity in the United States given mass communications, applied psychology, and a hysterical populace.  The novel is part of Heinlein's "Future History" series.

Rome, Sweet Rome: "Rome, Sweet Rome" is an alternative history and military science fiction short story by American freelance writer and military historian James Erwin that was posted online on Reddit under his handle "Prufrock451" on August 21, 2011.  It describes what might happen if a United States Marine Corps expeditionary unit were somehow transported back to the time of the Roman Empire under Augustus Caesar.  The first couple of installments were published on Reddit, corresponding to the first eight days of the Marines' arrival.  The full story is not publicly available because the rights were bought by Warner Bros., which announced the production of its movie adaptation.

Subdigitals: Code Loko; Subdigitals is an album released by MoonScoop featuring songs by the fictional musicians "The Subdigitals" (formerly "The Subsonics") in the French animated television series "Code Lyoko".  "A World Without Danger" was released as a physical CD single only in France, but was later imported to the several United States online retailers, including Amazon and eBay.  "Planet Net" was released as a music video single in order to promote the release of the soundtrack.

Supporting paragraphs: Year at Danger The World Without US
Answer: The World Without US