1. The first day of spring - March 20 marks the first day of spring, also called the vernal equinox. It is a significant day for many cultures around the world.

2. Cherry Blossom Festival - In 1912, the Mayor of Tokyo gifted 3,000 cherry blossom trees to the United States as a symbol of friendship. Many of these trees were planted in Washington D.C.'s Tidal Basin, and the National Cherry Blossom Festival now takes place every year in late March to celebrate their blooming.

3. March For Our Lives - On March 24, 2018, hundreds of thousands of people gathered in Washington D.C. for the March For Our Lives protest against gun violence. The protest was organized by survivors of the Parkland school shooting in Florida, and similar protests took place in cities across the United States.

4. The Women's Suffrage Parade of 1913 - On March 3, 1913, thousands of suffragettes marched in a suffrage parade in Washington D.C. to demand the right to vote. The parade received national attention, and helped to generate support for women's suffrage in the United States.

5. United States Capitol attack - On March 1, 1954, four Puerto Rican nationalists opened fire in the United States House of Representatives, injuring five members of Congress. The attack was a response to U.S. involvement in Puerto Rico, and led to significant changes in Capitol security.