Iron Sky

Iron Sky is a 2012 Finnish-German-American comedic science fiction film that sees Earth erupt into a nuclear war after the USA, having by films end nuked a Nazi Base on the Moon, claims the Moon as national territory.

Synopsis
A group of Nazis fled to the moon in 1945 and now plan a return to Earth in 2018. Their activities are at first peaceful as they assist in reviving the US during a great economic recession (though the public remains unaware of their involvement), but after one of their representatives gets too powerful the Fuhrer of the Moon decided to go ahead and launch an invasion of the Earth seeing the representative's influence on Earth as a threat to his own power. Meanwhile one of thier own has a change of heart and aids in the defeat of both Nazi factions though in Earth's great moment of victory (after the US nukes the lunar colony) the New United Nations (formed after the fall of the first some time between 2012 and 2018 and of much smaller membership) dissolves into infighting when America claims the former Nazi Lunar holdings as national territory and Nuclear War erupts while the Nazi deserter and an African American Astronaut look on and prepare to forge a new society.