In simplest terms, the Boston Tea Party happened as a result of “taxation without representation”, yet the cause is more complex than that. The American colonists believed Britain was unfairly taxing them to pay for expenses incurred during the French and Indian War.
Conquered territories were often left relatively unchanged under their old rulers as long as they recognized Aztec supremacy and paid tribute.
Hope this helps
For question one, its the first answer
and for question two its the last answer