There were several reasons for expansion. After the initial conquest of the New World, people saw the lands as opportunities they did not have in their own country. As they arrived from other countries in droves, they needed more space to grow. Also the lands were virtually free for the taking (In their eyes), so take they did. Mankind has an adventurous spirit and knowing there was more land to explore, they needed to do just that. The New World offered freedom from religious oppression and societal controls.
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they wanted more room in the small land they had.the sent lewis and clark on an expedition and they found saqugawiea to guid them to the pacifies and they had all that space from the Pacific Ocean to the Atlantic Ocean.
The Thirteen Colonies of Original America won the war against England. England and America both signed the Treaty of Paris. The Treaty of Paris had the expanded so that's why they began expanding after the thirteen colonies..
By the end of the 1800s, the United States had expanded to the limits of its borders. Continued expansion increased the likelihood of becoming a world power.
The Doctrine of Containment. Also called The Truman Doctrine.
Canada
The US was first the colonies of Britain, then the 13 colonies, then it was America, then the United States of America.
The official name is the United States of America. There are many nicknames such as America (which isn't often used outside the country), the United States (most widely used worldwide), the U.S., and the U.S.A.. Occasionally, the country is referred to as Uncle Sam as well, who is a symbol of the country.
The United States of America isn't a continent it is a country in North America.