By influential I mean carries lots of meaning (not just within the nation), is instantly recognizable, symbolises an influential or important cause, whether historically or in contemporary times. Here's the reason for my list:
Stars and Stripes: The American flag has come to symbolise freedom, liberty, and half the world during the Cold War era.
British Union Jack: Britain ruled the largest empire the world has ever seen, and the Union Jack has become part of many other national flags, such as Australia.
Soviet Union flag: It represented arguably the most influential movement of the 20th century, as well as Communism's dis-movement in the 1980's and 90's.
French tricolour: Brought in by the French Revolution, influenced virtually all of Europe's modern flags and represents all what the Revolution achieved.
Pride flag, because, you know... *AHEM*
Please post your reasons for your vote and feel free to discuss!
My vote goes to the Star and Stripes. It really has come to represent the world in recent times and the new world order. My second vote would be the French tricolour. It is quite important for us Europeans.
