What will the USA be like in year 3000? Population control and all or most in solar power? Or, wars & acid rain?

Are you are asking about a presently existing land mass or a political construct on that area of land. It is entirely possible that neither could exist in their present form. All it would take is for the super volcano in Yellowstone national park to erupt sometime in the next 1000 years. Scientists say it could erupt at any time and some of the land has risen over 10" in recent memory.

If it would erupt it might be an extreme form of "population control." The resulting global blackout may also make solar power lose some of its luster. Increased acid rain may also be a result of such catastrophe but wars over remaining resources are only a 50 50 chance.

The USA likely will not exist as a political entity. It will probably be geographically divided, perhaps East-West along the Mississippi, with union or encroachment by Mexico. Canada might be a thing of the future past as well since they have not the population or army to defend themselves from civil and political problems from it's southern neighbor. (Quebec might become it's own nation).

Well it wont be solar powered, solar power can only amount to 15% of the power supplied to the grid, anymore than that destabilizes the grid.

Sorry but all the crystal balls are on the fritz. Anyone's guess is as good as anyone else's. And it isn't an either or question. More like an unlimited multiple choice.

Watch the pilot episode of Futurama, and then you'll know.

we will probably find a way to harvest antimatter efficiently. Using that energy source.

At this time, jesus could have returned and take his people to the new earth

Nobody knows!!!