If you are talking about aztecs it is because they believed the sun gods need human blood to fuel them
The "Columbian Exchange" -- as historians call this transcontinental exchange of humans, animals, germs and plants -- affected more than just the Americas. In China, for example, the new era began when sailors reported the sudden appearance of Europeans in the Philippines in 1570. The astonishing thing about this was that they had come across the ocean from the east.
Answer:
Boston Massacre. The Boston Massacre occurred on March 5, 1770 when British soldiers in Boston opened fire on a group of American colonists killing five men. Prior to the Boston Massacre the British had instituted a number of new taxes on the American colonies including taxes on tea, glass, paper, paint, and lead.
Link:
https://www.ducksters.com/history/american_revolution/boston_massacre.php
