Answer:
Christopher Columbus found a new route to "Asia." Once Europe found out this was actually a whole "New World," other countries sent explorers out to claim land for their own country. England was one of these countries. They claimed land along the Atlantic Coast in the modern day US (as well as parts in Canada, several Caribbean islands, and parts of Central and South America.) and started pushing westward. This part came to be known as the 13 Colonies. The 13 Colonies broke away from British rule officially in 1783, and became known as the United States of America.