On March 5, 1770, the Boston Massacre took place, in which five Americans were killed in a confrontation with British troops. This incident helped to boost the popularity of the Sons of Liberty in Boston and was one of several major events that led to the American Revolution.
On March 23, 1775, Patrick Henry gave his famous speech in Richmond, Virginia, ending in "Give me liberty or give me death!" These powerful words would inspire Americans and many others around the world for centuries to come. It is considered one of the most epic speeches in American history. All of this is discussed in my latest book The Long Road to Revolution: The Many Conflicts in Colonial America.