Is being American a matter of geography or choice?

It can go both ways.

Explanation:

If you move here and work towards gaining citizenship, then obviously it is a matter of choice.

If you are born here then it is a matter if geography until you are an adult and then choice after reaching adulthood.

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.

this need to be done in 15 minutes kind of passed the 15 minutes by now sorry dude but i can list some of my thoughts down for you : (