1. On October 12, 1853, the Washington Territorial Legislature approved the formation of Pierce County, named after President Franklin Pierce, which encompassed a vast region of present-day Washington, including Tacoma and many surrounding areas.

2. In 1965, on October 12, the Seattle World's Fair officially ended after a six-month run that attracted over ten million visitors to the city, introducing groundbreaking technologies and cultural exhibits such as the Space Needle and the Bubbleator.

3. October 12, 1982, saw the birth of former Seattle Seahawks running back Marshawn Lynch, who played for the team from 2010 to 2015 and helped them reach two consecutive Super Bowls, including a historic victory over the Denver Broncos in Super Bowl XLVIII.

4. The state of Washington declared October 12, 2009, to be the first Indigenous Peoples' Day, recognizing and honoring the cultural contributions and legacies of Native American communities throughout the state.

5. On October 12, 2018, Washington State Attorney General Bob Ferguson announced a lawsuit against the Trump Administration's proposed rollback of federal protections for transgender individuals, marking a significant moment in the ongoing fight for LGBTQ+ rights and equality in the state.