A. Truman Doctrine, it was an American policy to contain soviet expansion during the Cold War
I believe that the three countries which were fighting for control over North America were England, Spain, and France.
All of these countries wanted to have a piece of this new continent they accidentally discovered. Somehow, France got the northern parts (Canada especially), Spain got the southern parts (especially Mexico), and England got the middle.
Answer:
to avoid falling under the influence of global powers.
