Reviewing the information related to the Mexican-American War, evaluate the events leading up to the war and why it happened.

Reviewing the information related to the Mexican-American War, evaluate the events leading up to the war and why it happened. Consider the following questions as you respond:
What decisions or actions played a key role in starting the war?
What were the results of the war?
There is no right or wrong answer. State your argument and provide evidence from the text to support your statements.