nobody on Nostr: I am really retarded when it comes to international military history (except for all ...

I am really retarded when it comes to international military history (except for all my family); is the united states of america somehow obligated militarily to any other countries in the world? Please define like i am a five year old (because really, my public school education did not include any of this information, nor economic basic information, nor tax basics. Please solve for why