Its C.) Native Americans. They were the last to be granted U.S citizenship.
This is because it was when the Allies were able to defeat the Axis powers, which gave hope to the Allies to fight stronger. Also, when they defeated Axis powers at that battle, they(ALLIES), now had vantage points on both sides of Germany; east(UK) and west (Russia).
A reason is because when it floods it waters all their plants and it's one of their only water sources :)
