'Captain America: Civil War' feels more like an Avengers movie to me than a Captain America movie. I don't know why. Maybe because it has all the Avengers in it. You wonder who names these things. At a certain point it doesn't really matter. They'll all be in each other's movies so much that you won't know what to call them. Should it have been 'Thor: Ragnarok' or 'Hulk: Ragnarok?'
This movie is loosely based on the comic book series 'Civil War' which I highly recommend if you want to buy four hundred comic books. Not only are there Civil War issues, but there are also issues of everyone else's comic books around the Civil War storyline. If you wanted to follow every single one you'd have to put out a second mortgage on your home.