You know that may happen one day...this country is too big and too diverse to be run by one President, one Congress. I would like to see it divided in four long parts, each following the Constitution, BUT having the legal structure to make law specifically pertaining to their own strengths and weaknesses. One overall President and Congress, but maybe each segment having their own Vice President and their own law making entity. Certainly no borders between each, but more specific legislation for each segments’ needs. I feel some segments of the nation don’t get adequate representation...some states too small, some too large, some states mainly Dems, some mainly Republican, thus the majority in each state rules. With four long segments of the country there might be better representation. Hey, I’m an old coot, what do I know?
It would obviously add another level of government, but perhaps that might work because as you stated...our country is very, very diverse now and the existing fed gov one size fits all for domestic issues isn't working anymore.