Marvel Comics is an American company, so it's no surprise that the United States was the first country to be find itself reflected in a superhero motif.
Captain America was created by Joe Simon and Jack Kirby in 1941, as a rallying cry for the US to enter the Second World War, but Captain America isn't the only hero with patriotic sensibilities. Over the years, a number of heroes with pride in their home turf have popped up, ready to represent their nation and protect it from potential threats.
Now, with the MCU's Steve Rogers' retirement at the conclusion of Avengers: Endgame, there's room to explore other heroes who so boldly emblazoned their home country's flag on their chests. Black Widow will bring us Red Guardian, and a certain USA gent is set to debut in the Disney+ series Falcon and the Winter Soldier. Just last month, Marvel also announced new team The Union, a group of four heroes each representing a different country within the United Kingdom.
It's a pretty good time to be a Marvel national hero, so it might be useful to brush up on the smorgasbord we have to pick from in time for Marvel's upcoming efforts.