Senate Joint Resolution 429, sponsored by Gardenhire, commemorates the 250th anniversary of the Battles of Lexington and Concord, which took place on April 19, 1775, marking the beginning of the Revolutionary War. This resolution recognizes the significance of these battles, often referred to as the "Shot Heard Round the World," as pivotal moments that united the American colonies in their fight for liberty and independence. The resolution encourages cities, counties, and states to participate in the celebration from 2023 to 2033, designated as the "Decade of the American Revolution" by the Sons of the American Revolution.

The resolution details the events of April 19, 1775, when Massachusetts patriots confronted British troops ordered to seize arms in Concord. The initial skirmish at Lexington Green resulted in casualties on both sides, and as the British retreated, they faced increasing resistance from local militias. This collective action galvanized support for the revolutionary cause among previously neutral colonists. The resolution calls for a joint commemoration on April 19, 2025, alongside various patriotic and veterans' organizations, to honor the sacrifices made during these historic events.