1. Vermont became the 14th state in the United States on March 4, 1791, and March 15 of the same year marked the first meeting of the Vermont General Assembly as an official state government. The Assembly met in Windsor and established the first state constitution.

2. The infamous "Warren Gore Massacre" took place on March 15, 1803, when a dispute over land rights among settlers in Warren and Gore, Vermont, erupted into a violent conflict. Seven people were killed in what became one of the bloodiest episodes in Vermont's early history.

3. On March 15, 1915, the Vermont State Highway Department was created, marking a significant step forward in the state's transportation infrastructure. The department was tasked with maintaining and improving Vermont's roads and highways, which were crucial for the state's growing tourism industry.

4. The Vermont Maple Festival, a celebration of Vermont's famous maple syrup, began on March 15, 1967, in St. Albans. The festival has since become one of the state's most popular events, featuring sugarhouse tours, maple tastings, and a variety of other activities.

5. March 15, 2017, marked the opening of the Vermont State House, following a comprehensive four-year renovation project. The iconic building, which serves as the seat of Vermont's government, received upgrades to its heating and ventilation systems, lighting, and accessibility features. The project also included the restoration of historic artwork and other features of the building.