Germany, England, and France. As each nation is a member of NATO (North Atlantic Treaty Organization), the US has promised to deliver military aid if they have been invaded or attacked by another nation. So, the United States would send extra troops overseas to assist current groups stationed in Europe. In times of peace, it is most typically economically, but sometimes, US presence in times of increasing hostility is enough to cause the aforementioned hostilities to cease. In both times of war and peace, these nations should assist in the same way as the United States does.
The growth of the silk road was greatly impacted by the growth in technology specifically modes of transportation. As the ability to move from place to place improved more trips were made and therefore the increase of trade products and use of the silk road took place.
The correct answer is manifest destiny.
Manifest destiny is the belief that it was America's god given right to expand from "sea to shining sea." In other words, it was America's destiny to expand their control across the entire North American continent from the Atlantic to the Pacific Ocean. This belief resulted in the US buying land from other countries, fighting in wars, and taking land from Native Americans in order to achieve this goal. This was present throughout American society during the early to middle of the 19th century.
