The Atlantic Ocean.
Atlantic ocean
Eastern U.S.A.
Pacific Ocean on the left and Altantic Ocean on the right
the indian ocean
Atlantic.
Atlantic Ocean touches 12, or 13 if you count DC, and the Pacific Ocean touches five different US states..
The eastern border of the US was and is the Atlantic Ocean.
The Atlantic Ocean defines the United States' eastern border.
The only US State that touches the Arctic Ocean is Alaska
The Atlantic ocean is on the eastern side of the US.
Atlantic ocean
The Treaty of Paris in 1783 officially established the eastern boundary of the United States along the Atlantic Ocean after the end of the American Revolutionary War. The Adams-Onís Treaty of 1819 between the US and Spain further solidified the western boundary by ceding Florida to the US and setting the boundary with New Spain.