If you have not seen yet Avengers: Endgame, you should know that, from here, you will find SPOILERS. The film is a roller coaster of emotions that take us from sadness to joy with its jokes, and precisely one of these continues to echo in our mind.
Iron Man, Ant-Man, Captain America and Hulk travel to 2012 looking for the gems of space, minds and time. While the Avengers of the past capture Loki, Tony says that the soldier's uniform (Steve) did not do his backside any good, but Scott says there's nothing wrong with that part of his body and that's the United States butt .
In addition, and during the fight between Captain America and his past self, Steve looks at himself lying on the ground and says that he really has America's butt, something that none of us can deny seeing the evidence.