Solar only became "economical" (read: profitable) because a socialist economy dumped a huge amount of money into scaling it up without requiring it to be "economical". It could have been half a century or more ago if we actually cared.

Nuclear was not stopped by the environmentalists, it was stopped by the fact that it cost 4X more than coal at the time. You claim that solar wasn't profitable in the west, thus it didn't take off, surely you can also see that nuclear wasn't profitable in the west, thus it didn't take off as well.

The same country that invested the time and money to make solar profitable is also investing the time and money to make nuclear profitable, with nuclear reactors entering mass production...

It was never about "economical", it was about a system being mature enough to make long term investments. Ours simply can't do that anymore.