Revert back to the old lifestyle and get taken over by people with superior technology and weapons?
The main reason the Europeans were able to take over the world was because they were inquisitive and invested time and money into science. Science which they used to develop weapons like guns, cannons, nuclear weapons etc that were used to take over less developed societies.
It's no different today, the reason why America is able to invade so many countries is due to their superior technology and weapons.