Although I could already read, I wasn't born until 1940, two years before the end of Jim Crow legalized slavery in southern states from Texas to the Carolinas. Because Republicans were still the Party of Lincoln, what were called Dixie Democrats ruled politically in the single-party eight or nine states of the Deep South and thus, an illegal system of peonage slavery continued to thrive from Texas to the Carolinas until demand for labor in Federally funded WWII armaments manufacturing put an end to it in 1942.
Republican politicians may have been in power most everywhere in 1930, but their party was almost as dysfunctional and divided then between conservative and progressive ideologies as it is today between conservatives and radicals (Tea Party, ultra-conservatives, fundamentalist Christians, Libertarians, Ted Nugent Nazis, etc). Remember that it was Teddy Roosevelt Republicans who founded the short-lived Progressive Party in their failed effort to replace do-nothing conservative Republican Howard Taft in the White House, but only succeeded in putting Democrat Woodrow Wilson there for two terms through WWI.
Republican conservatives roared back into power following WWI and with a succession of three do-nothing Federal administrations managed to drive America and a rapidly expanding middle class from record-setting boom to the financial-economic collapse of 1929-30. The advent of the Great Depression resulted in four terms of Democratic FDR presidency and another war driven prosperity. Post WWII Republicans came back into power again, but this time weakened by the burden of shame for the Great Depression era conservatism that the once proud progressive Party of Lincoln had suffered.
The Republicans, who still called themselves the Grand Old Party (GOP), came out of the Great Depression and WWII cloaked politically in moderation with a new kind of modern progressive attitude and managed for three decades to keep up with or better their Democratic opponents until silly political scandal struck. The influence of moderate Republicans began a slow decline, Dixi Democrats switched parties to become ultra-conservative Republicans, political coalitions were formed with religious fundamentalists and anti-government do-nothings and 50+ years after the economic collapse of 1929-30, a Republican conservative administration was returned by the White House.
The old adage that civilized people should learn from past mistakes doesn't apply to the American electorate for whom the study of history is even more evil and devilish than science. What goes around comes around and once again as inanimate progress outstrips American ingenuity, we are in the shit with a growing, healthy economy and an imploding middle class lorded over by capitalist corporate pigs. Americans always deserve what we get.