Charles Mills, author of The Racial Contract:

“There is a dynamism inside liberalism that they miss,” he told me. “The huge advantage of liberal democracy over other political systems is that its leadership constantly adjusts and changes, shifting to absorb new people and ideas. Liberal democracies don’t try, as Soviet Marxism once did, to make everybody agree about everything, all the time”

Democracies Don’t Try to Make Everyone Agree by Anne Applebaum, The Atlantic

The problem is, at one time a majority of citizens of the United States knew what are the things that we do and need to agree about.