World War III ends and Earth is left devastated, mostly because of nuclear warfare. Most of the major cities are left in ruins with few remaining governments and the death total reaching 600 million.

https://en.wikipedia.org/wiki/Timeline_of_Star_Trek

Push the button. Only 600 million is a generous offer. This timeline will have many more.

Yep, we are on track already to live in the star trek universe. We just have to live through WW3 first and it will be paradise.