Federalism is what I recommend to ease tensions and preserve the Union. Patrick J. Buchanan explains it well. His piece concludes:
A new federalism—a devolution of power and resources away from Washington and back to states, cities, towns and citizens, to let them resolve their problems their own way and according to their own principles—may be the price of retention of the American Union.
Let California be California; let red state America be red state America.