1. On February 18, 1867, the Russian Empire signed the Treaty of Saint Petersburg, officially transferring ownership of Alaska to the United States. The purchase, known as the Alaska Purchase, cost the US $7.2 million and sparked controversy at the time.

2. In 1953, on February 18th, a magnitude 7.3 earthquake struck near the Aleutian Islands in Alaska. The earthquake generated a tsunami that caused extensive damage to several coastal communities and resulted in the deaths of several people.

3. On February 18, 1991, the Alaska Native Claims Settlement Act was passed into law. The act provided a means for Alaskan Natives to gain control over their own land and resources, and to settle land claims with the state and federal governments.

4. On February 18, 2019, a large snowstorm hit the city of Anchorage, causing widespread power outages and road closures. The snowfall that day set a new record for the amount of snowfall in one day in the city's history, with over 16 inches of snow.

5. In 1965, on February 18th, the Alaska State Flag was adopted by the state legislature. The flag features a blue field with eight gold stars representing the constellation Ursa Major, or the Big Dipper. The flag has become a symbol of Alaska and is often seen flying at public buildings and events throughout the state.