Final answer:
On April 19, 1775, the Battles of Lexington and Concord took place, marking the commencement of the American Revolutionary War and leading to the establishment of the Continental Army.
Step-by-step explanation:
Important Historical Event in April 1775
On April 19, 1775, a pivotal moment in American history occurred with the Battles of Lexington and Concord. This marked the start of the American Revolutionary War, often characterized by the phrase "shot heard around the world". The British, seeking to suppress the growing unrest in the colonies, moved to seize weapons and ammunition and arrest leaders of the resistance in Massachusetts. However, they were met by colonial militias in Lexington and subsequently in Concord. The confrontations resulted in the deaths of several colonists and the retreat of British forces back to Boston, with skirmishes continuing along the way. This event escalated the tensions between Great Britain and the American colonies, leading to the establishment of the Continental Army and signaling the beginning of the colonists' struggle for independence.