The United States of America is bordered by the Pacific Ocean on the west side.
No country borders the US to the west. The western border of the US is the Pacific Ocean.
The Arctic Ocean.
Peru
The Atlantic Ocean borders Europe to the west, not a country.
The Pacific Ocean.
Every ocean on earth borders the west of some continent.
France is bordered by the Atlantic ocean to the west; this is the only direction where there isn't any neighbouring country.
West of the contiguous states is only the Pacific Ocean. West of Alaska, across the Bering Strait (and the International Date Line) is Russia, from which the United States purchased Alaska.
The South Atlantic Ocean is the body of water to the west of South Africa. The Indian Ocean is located to the east of the country.
Russia.
East of North America lies the Atlantic Ocean.