Humanity reached post scarcity type two civilization status, expanded across the entire solar system and were content to live the next 4 billion years in perfect comfort. 8 billion people wanted to struggle, so they left in enormous generation ships. Two thousand years later, their descendants must figure out how to live in a new solar system.
"We go into space because whatever mankind must undertake, free men must fully share."
President John F. Kennedy
The Year is 1950. You have the opportunity to take humanity to space. Good Luck.