Climate migrations from Central and South America, but they'll settle in the Midwest and northern states instead.

Northern states will have a greater economic and political presence in regards to agriculture.

People living on the coast will be pushed further inland. Cities with enough money will attempt to dam up the water, but that's a temporary solution.

West will burn up. However, with lack of rainfall, that brush won't grow back as easily. So, in time, the wildfires will sort of even out.

A reliance on imports from China as the American agricultural sector reforms itself, but of course, China will be restructuring itself too (albeit far more efficiently).

Climate change will go from denial to "well it's a natural thing as Jesus intended" and the right will still be cutting every regulation they see.