Donald Trump is not a riddle, a monster or a mystery. Trump has many antecedents in American history, and his ascendance was the wholly predictable result of a broken political culture.

For progressives and those others worried about America’s deep political rot, “Trumpmania” represents a supreme and rare teachable moment, one that exposes the racism, authoritarianism, and socio-political anxieties of white movement conservatives in the post civil rights era and the age of Obama.

In many ways, Donald Trump has written a virtual textbook about the worst aspects of present-day, right-wing American politics. This book, if ever published, would include the following important concepts.

1. White identity politics. Donald Trump has been endorsed by prominent white supremacists and white nationalists as their chosen candidate.

(Political socialization begins in the home. According to recently discovered news reports from 1927, Trump’s father was likely at least a sympathizer with, if not a member, of the Ku Klux Klan.) From the end of the Civil Rights Movement onward, the Republican Party has used a strategy of white grievance mongering known as the Southern Strategy to mobilize its voters.

As a complement to the Southern Strategy, since the election of Barack Obama, the right-wing Fox News hate media has obsessively channeled racist narratives such as “birtherism,” “black crime,” and most recently the lie that the Black Lives Matter movement is an anti-white hate group.

The Republican base is almost entirely white, increasingly alienated and upset about the perceived decline in white people’s political and social power, and feeling under siege in a country that is becoming more racially diverse. Donald Trump has combined the old fashioned racism of overt white supremacists with the modern white racist “dog whistle” politics of the Republican Party. He is the new face of American white identity politics in the 21st century.