Because it gave them the ability to stand up when riding horseback
It increased the size of the United States because it was based on the idea that America was destined by God to expand from the Atlantic to the Pacific, in other words, it encouraged many to expand west.
hope this helps i actually just learned about this in class :)
The answer is "Religious Liberty"
the map should also include the area along the coast and it should be a lot like the modern day china map beside for is half and don't include the areas in the west like the mountain ranges when the open door policy happened it made china lose control because other religion come in and china's people start to believe in different thing
It was c because they was the first one I am 98℅ sure.