The Boston Massacre is considered one of the most significant events that turned colonial sentiment against King George III and British Parliamentary authority. John Adams wrote that the "foundation of American independence was laid" on March 5, 1770, and Samuel Adams and other Patriots used annual commemorations (Massacre Day) to encourage public sentiment toward independence.
It helped America pull away from British rule and establish a new country on it’s own.
The south used these laws to prevent African Americans from voting although it backfired since many of the white southerners didn't have money or much education either.
The Civil War took place in America over an internal struggle. It was over two different beliefs and the country was divided over this idea. This led to a struggle that would be one of the bloodiest wars in american history.