Here are some interesting facts about March 17 in Alabama history:

1. St. Patrick's Day - March 17th is a famous holiday in the United States celebrated as St. Patrick's Day. Alabama has a rich history of celebrating St. Patrick's Day with various events and parades across the state.

2. Union Soldiers Invade Mobile - On March 17, 1865, Union soldiers arrived in the city of Mobile during the American Civil War. The troops under Union General Canby captured the city, and it marked a significant moment in the fight to end the Civil War.

3. Montgomery Bus Boycott Trial - On March 17, 1956, the Montgomery Bus Boycott trial was concluded, and the decision was made in favor of the bus boycotters. The bus boycott was started by African Americans in response to the discriminatory treatment they received on the buses in Montgomery, Alabama.

4. Statehood Day - On March 17, 1819, Alabama was officially admitted as the 22nd state in the United States. This day is celebrated as Alabama Statehood Day, which marks a significant moment in the state's history.

5. Civil Rights Activism - March 17 is also marked by various civil rights protests in Alabama. In 1960, African American students staged a sit-in at the Montgomery Public Library, which was segregated at the time. This event was a part of the larger Civil Rights Movement happening all over the southern United States.