Which ocean borders the east coast of the United States?

The Atlantic Ocean is the body of water that borders the east coast of the United States. It stretches from the northern parts of the U.S., near Maine, down to Florida in the south. This ocean is significant because it has played a crucial role in the history and development of the United States, serving as a primary route for exploration, trade, and immigration. Major cities located along the East Coast, such as New York, Boston, and Miami, have direct access to the Atlantic, which has influenced their economic and cultural development.

The Indian Ocean, Pacific Ocean, and Southern Ocean are incorrect in this context as they do not border the eastern coastline of the U.S. The Pacific Ocean lies to the west, while the Southern Ocean is located around Antarctica and the Indian Ocean is far to the south and does not touch the U.S. at all. Each of these oceans has its own geographical significance but is not relevant to the borders of the east coast of the United States.