1. On March 12, 1862, the Delaware General Assembly voted in favor of amending the state constitution to abolish slavery. This made Delaware the last state in the Union to officially abolish slavery, although the institution had already been in decline in the state for several decades.

2. In 1923, on March 12th, the Du Pont family donated a large tract of land in northern Delaware to the state, creating the Brandywine Creek State Park. Today, the park features over 900 acres of rolling hills and woodlands, as well as historical sites such as the Brandywine Battlefield and the John Chads House.

3. On March 12, 1941, the Wilmington-based shipyard of Bethlehem Steel launched the USS Samuel Chase, a World War II-era troop transport ship. The Chase was used to transport American soldiers and supplies during the war, and was later decommissioned and sold for scrap in the 1960s.

4. In 1972, on March 12th, Delaware became the first state to ratify the Equal Rights Amendment to the U.S. Constitution. The ERA aimed to guarantee equal legal rights for all American citizens regardless of sex, but fell short of being ratified by the necessary number of states to become part of the Constitution.

5. On March 12, 2014, a major winter storm dubbed "Winterstorm Titan" hit Delaware, dumping over a foot of snow in some areas and causing widespread power outages. The storm caused significant travel disruptions as well, with many flights cancelled or delayed at Philadelphia International Airport.