1. On November 20, 1789, Pennsylvania became the second state to ratify the US Constitution, which established the framework for the federal government and its powers.

2. In 1851, the Pennsylvania Railroad completed the Horseshoe Curve, an engineering marvel that allowed trains to climb the steep Allegheny Mountains and connect Pittsburgh with Philadelphia and the eastern seaboard.

3. On November 20, 1920, the first football game was broadcast on radio from Pittsburgh's Forbes Field, as the University of Pittsburgh defeated West Virginia University, 21-13.

4. In 1953, the landmark Supreme Court case Brown v. Board of Education was argued before the Court, challenging racial segregation in public schools in Topeka, Kansas. The case was based on Pennsylvania's 1854 constitution, which declared education a "fundamental right."

5. On November 20, 1975, former Pennsylvania Governor Milton Shapp signed the nation's first law banning discrimination based on sexual orientation in employment, housing, and public accommodations, ushering in a new era of LGBTQ+ rights in the state.