Answer:
Manifest destiny is a belief that many people in America at that time held. This belief made them convinced that they're somehow destined by God to spread democracy and capitalism to the rest of North America. The people at that time belief that it's the only correct system to ensure the freedom of all citizens.
But due to the large size of its territory, it is difficult to reach many different areas in north America. Railroad companies already exists. But, most of them only operates within one state. This problem was somehow solved by the creation of Transcontinental Railroad.
The transcontinental railroad was built with the intention to create a pathway connect all part of North America. It is an important infrastructure for the American people to create settlements in every corner of the country. This helped them spread the ideologies as intended in Manifest Destiny.
Congress passed the War Powers Resolution in the aftermath of the Vietnam War to address these concerns and provide a set of procedures for both the President and Congress to follow in situations where the introduction of U.S. forces abroad could lead to their involvement in armed conflict.
