Westward expansion also manifest destiny
This possibly led to the creation of small and new countries that were once colonies of bigger countries
I believe the answer is: constitution in Article I
The article I of the constitution directly state the power of the Congress along with its limitation. They specify that congress is the one that has the power to create the laws in united states and they have to be separated into two sections (the senates and the house of representatives)
Superior manpower, industry, access to trade, finances, leadership, and more.
Answer:
number 3 I hope this helps
