1. George Washington signed the first federal law to regulate copyright on March 16, 1790. The law was titled "An Act for the Encouragement of Learning" and protected the rights of authors and creators to profit from their work.

2. The Seattle Mariners played their first game as a Major League Baseball team on March 16, 1977. They lost the game to the California Angels 7-0, but it marked the beginning of a new era for professional sports in the city.

3. The Yakima Valley Community College was founded on March 16, 1928 in Yakima, Washington. The college initially offered courses in agriculture and mechanic arts, and has since grown to offer a wide range of academic programs.

4. The Tacoma Dome, a multi-purpose arena located in downtown Tacoma, Washington, opened on March 16, 1983. The venue has hosted a variety of events over the years, including concerts, sporting events, and trade shows.

5. The Washington State Legislature passed a landmark clean energy bill on March 16, 2021, which aims to transition the state to 100% clean electricity by 2045. The law includes provisions for investing in renewable energy, supporting the development of electric cars, and reducing greenhouse gas emissions.