Name the country on eastern border of USA?

The country on the eastern border of the United States is Canada. Canada shares a land border with the United States to the north, stretching from the Atlantic Ocean in the east to the Pacific Ocean in the west. The Canada–United States border is the longest international boundary in the world, spanning approximately 5,525 miles (8,891 kilometers). The two countries maintain a close and cooperative relationship, with extensive economic, social, and cultural ties.