1. 1967: The Apollo 1 spacecraft fire occurs at Cape Kennedy Air Force Station Launch Complex 34, resulting in the deaths of astronauts Gus Grissom, Ed White, and Roger B. Chaffee.

2. 1973: The Paris Peace Accords are signed, officially ending the U.S. involvement in the Vietnam War.

3. 1996: In a chess match against IBM’s Deep Blue, world chess champion Garry Kasparov wins the first game but eventually loses the overall match.

4. 2010: The U.S. Supreme Court, in the case of Citizens United v. Federal Election Commission, rules that corporations and unions can spend unlimited amounts in support of political candidates.

5. 2017: President Donald Trump signs an executive order to begin the process of constructing a wall along the U.S.-Mexico border to address immigration issues.