1) In 1968, the Good Friday earthquake, the second-largest earthquake ever recorded with a magnitude of 9.2, struck Alaska on February 21. The earthquake caused a massive tsunami that devastated coastal communities, killing 139 people and causing extensive damage.

2) On February 21, 1917, a group of striking copper miners were killed in what is known as the "Wrangell Massacre" in Cordova, Alaska. The miners were striking for better wages and working conditions, and were attacked by a group of vigilantes. Seven miners were killed and many others were injured.

3) In 1983, the Iditarod Trail Sled Dog Race began on February 21. The 1,000-mile race from Anchorage to Nome is known as one of the toughest sled dog races in the world and attracts mushers from around the globe.

4) February 21, 1914, marked the founding of the Alaska Native Brotherhood, an organization dedicated to protecting the rights and interests of Alaska Natives. The organization played a key role in advocating for Native land rights and civil rights in Alaska.

5) On February 21, 1965, Malcolm Davis, an Alaska Native leader and advocate for civil rights, was elected the first Alaska Native mayor of the city of Bethel. Davis served as mayor for six years and played a critical role in improving living conditions and infrastructure in the community.