I remember when people didn't have phones on them 24/7 and kids didn't die and parents could call the school if they needed to talk to the kids. Somehow we survived.
They actually are. They are by far the biggest economy, Americans buy way more stuff then people in other countries. It is why every country wants access to the US market.
Can we the rest of the world survive without them yes but it well hurt.
Can you even choke out a bear? I mean I know technically it's possible but I would imagine their neck is a little more protected then ours.