Here are 5 interesting facts about March 21 in Alaska history:

1. In 1919, the U.S. Congress passed the Alaska Railroad Act, which authorized the construction of a railroad in Alaska to connect the port of Seward to Fairbanks. This act helped to create thousands of jobs and stimulate economic growth in Alaska.

2. In 1964, a massive earthquake with a magnitude of 9.2 struck Alaska, causing widespread damage and triggering a tsunami that devastated coastal communities. This earthquake was the second-largest ever recorded and is known as the Great Alaska earthquake.

3. In 1943, the first dog sled race of the Iditarod Trail Sled Dog Race was held. This annual event begins in Anchorage and ends in Nome, covering a distance of approximately 1,000 miles.

4. In 1925, the famous serum run to Nome occurred, in which sled dog teams transported diphtheria antitoxin serum from Nenana to Nome to combat a deadly outbreak. The serum run is commemorated every year with the Iditarod Trail Sled Dog Race.

5. In 2006, a new world record was set for the largest snowman built, measuring 37.21 meters tall. The snowman was built in Anchorage, Alaska, by volunteers using 700 truckloads of snow.