The Democratic Party has taken the minority vote for granted for a long time, and it thought that pushing PC and Identity Politics would keep it that way.
Maybe not, huh?
Another completely false reading of what happened to the Democrats. Reagan was so insanely popular with Americans, with his hating on social programs, unions, taxes, and the War on Poverty, and the support of the Moral Majority and with its anti-woman agenda. The thing is that once in power, Reagan's policies of cutting the social safety net, ending the war on poverty, and cutting taxes for the rich, increased poverty and food stamp useage. Two years after Reagan took office, food stamp useage had doubled, even though qualifications had tightened under Reagan.
Reagan laid the groundwork and began the transfer of wealth to the top 10% and America loved him for it. The only way for Democrats to win was to appeal to less radical Republicans, those who weren't really benefitting from the Republican Credit Card economy, was to turn themselves into "Republicans lite". That's what Bill Clinton did. Clinton managed to raise the minimum wage and get some worker protections into NAFTA before it was signed into law, but Democrats only held the House for two years before Newt Gingerich and his "Contract with America" crowd took over and worked on deregulating Wall Street and keeping Democrats from essentially doing anything for the poor or minorities thereafter.
For the next 12 years, Republicans controlled the House and gradually took greater and greater control of the State Houses, cutting spending on infrastructure, education, research. Promoting the vilification and partisanization of the American people, literally pitting rural and mostly white states, against the coastal states with a more diverse population, and falsely portraying Democrats as "communists, out to destroy America".
Over the years, Republicans had promoted a falsely partisan agenda, all while lying endlessly about Democrats, leftists, and social spending of any kind. Three of the last four Republican Presidents have literally crashed the economy, cutting taxes and leaving the cupboard bare in a national emergency. Just like W, after 9/11, the economy has to go into deep deep deficit spending to cover the economic contraction. That lead to a much bigger crash in 2008.
Trump has mishandled this crisis so badly that the level of death and illness in the highest in the world, and the contraction in the US economy is also the highest in the first world. I don't see this ending well for the American people. The working base who voted for Trump are now the ones who are dying. And the black people who stayed home last time, are dying at much higher numbers than the old white people.
Nothing fails like killing off your base to save your economy, failing to save with the people or their jobs.