1. In 1868, the U.S. government purchased Alaska from Russia for $7.2 million, a deal known as the Alaska Purchase. March 31 marks the anniversary of the completion of the transfer.

2. In 1899, gold was discovered in Nome, Alaska, sparking a gold rush that brought thousands of people to the region. March 31 is the birthday of the city of Nome, which was officially incorporated in 1901.

3. In 1922, the Alaska Native Brotherhood (ANB) was formed in Sitka, Alaska. The ANB is a civil rights organization that advocates for the preservation of Native culture and the recognition of Native rights. March 31 is recognized as ANB Day in Alaska.

4. In 1932, an earthquake with a magnitude of 7.2 struck the Prince William Sound region of Alaska. The earthquake caused a landslide that created a huge wave, known as a tsunami, which destroyed the small town of Chenega.

5. In 1971, the Alaska Native Claims Settlement Act (ANCSA) was signed into law. The act provided for the settlement of Native land claims in Alaska and established a system of land ownership and management that includes Native corporations. March 31 is recognized as ANCSA Day in Alaska.