The AP History syllabus is broad and diverse. From learning about the prohibition of the manufacture, transport, or sale of alcoholic beverages under the 18th Amendment (1920–1933) and "the Jazz Age", the Bread and Roses Strike in Lawrence (1912), the Boston police strike (1919), and the Massachusetts trials, appeals and execution of Nicola Sacco and Bartolomeo Vanzetti (1921) to the diplomatic and military policies on the War in Vietnam of Presidents Eisenhower, John F. Kennedy, Lyndon Johnson, and Richard Nixon and explain the intended and unreported (at the time) consequences of the Vietnam War:
https://apcentral.collegeboard.org/courses/ap-united-states-history/professional-learning
In terms of foundations of modern government, it covers domestic policies of Presidents Truman and Eisenhower (e.g., Truman's Fair Deal, the Taft-Hartley Act (1947), the Federal-Aid Highway Act (1956), Social Security Disability Insurance Act of 1956) and analysis of the roots of domestic communism and anti-communism in the 1950s, the resistance to McCarthyism, researching and reporting on people and institutions such as Whittaker Chambers, Alger Hiss, FBI Director J. Edgar Hoover, Senators Joseph McCarthy and Margaret Chase Smith, Julius and Ethel Rosenberg, the American Communist Party, the House Committee on Un-American Activities, and congressional investigations into the Lavender Scare:
https://www.facinghistory.org/resource-library/lavender-scare-gay-and-lesbian-life-post-wwii-america
Economic history and consideration of competing economic theories that explain the Great Depression (e.g., insufficient demand for goods and services (Keynesianism) vs insufficient supply of money (monetarism) is core to the syllabus and a good online history teacher will educate students about the legacy of democratic government and incorporate diverse perspectives that build historical research literacy and reasoning skills in weighing bias, making logical arguments, and bolstering reading comprehension by increasing content knowledge.