Earth-1 (Post-Crisis)

"We're talking about a being whose very existence challenges our own sense of priority in the universe. And you go back to Copernicus, where he restored the Sun in the center of the known universe, displacing Earth. And you get to Darwinian evolution, and you find out we're not special on this Earth, we're just one among other lifeforms. And now we learn that we're not even special in the entire universe because there is Superman. There he is. An alien among us. We're not alone."

- Neil deGrasse Tyson

Earth-1 is one of the many universes in the New Multiverse.

Creation
During the Crisis, Oliver Queen and the Paragons recreated the destroyed multiverse. Among those universes in the recreated multiverse is Earth-1.

Residents
See here.