1. On June 26, 1974, the U.S. Supreme Court ruled in the case of District of Columbia v. John R. Thompson Co. that under the Sixth Amendment, criminal defendants have the right to a trial by an impartial jury. This landmark decision is still cited by lawyers and judges today.

2. In 1998, the Smithsonian National Postal Museum opened in Washington, D.C. on June 26th. The museum houses one of the largest collections of stamps and philatelic materials in the world, and features exhibits on various aspects of postal history and technology.

3. On June 26, 2015, the U.S. Supreme Court issued a historic ruling in the case of Obergefell v. Hodges, which legalized same-sex marriage nationwide. This decision was a major victory for the LGBTQ+ community and marked a major turning point in the fight for marriage equality.

4. On June 26, 1961, President John F. Kennedy gave a speech urging Congress to pass legislation guaranteeing voting rights for all Americans, regardless of race. This speech played a key role in the eventual passage of the Voting Rights Act of 1965.

5. June 26, 1950 marked the beginning of the Korean War, which lasted until 1953. Despite the fact that the conflict never officially ended and has been referred to as the "forgotten war," it had a significant impact on U.S. foreign policy and international relations in the decades that followed.