The Cold War

Response to the Soviets

 * With Europe destroyed, the United States would become a leader in trying to stop the Soviet Union.
 * War could not be declared, because the U.S. knew that the Sovet Union would be the victor. The U.S. did not have enough backing from its allies.
 * U.S. troops stayed in Europe to ensure that the Soviet Union would not encroach any further.

Canada

 * Us-canada-and-mexico-map_426748.png British power sinking, Canada became an issue for the British.
 * They could no longer afford to hold onto it, so they sold it to the United States.
 * The U.S.'s Manifest Destiny would almost be fully realized at this point.

Mexico
Next
 * Seeing the little territory that Mexico still held as a threat to the U.S.'s southern border, the U.S. moved south to annex the rest of Mexico.
 * The U.S. would come to control the majority of North America.