Best book for understanding Trump-Russia, and how we got here: @timothydsnyder, Road to Unfreedom.
Snyder is fluent in multiple language (I think 11) and uses primary sources in original languages.
Best book for understanding what happened to the Republican Party, and our current slide into oligarchy, To Make Men Free, @HC_Richardson
If you want to understand race in America, this is a great book. It purports to be a history of Brown v. Board of Education (the case that ended segregation in America) . . .