Puritan work ethic
Civics
American Revolution
“Capitalism” vs Communism (and the horrors of totalitarianism)
But with the “end of of the Cold War (WWIII against the USSR) we stopped teaching Americans and ushered Communists into teach in the classrooms (see Howard Zinn’s peoples’ history of Amerika and California Democrats repealing the prohibition on Communists and seditionists teaching in schools or advocating those positions).
To me, it took until the end of the Cold War for the Communists in the elite schools and their fellow travelers who took communism into the American school system to fully infiltrate it. And with the fall of the Soviet Union, American’s stopped seeing communism as a threat and thus the Communist Fifth Column was set to take over the country. And their infiltration and control of the Democrapt Party was completed.