Which ocean borders the west coast of the United States?

The Pacific Ocean borders the west coast of the United States. This is because the United States is located on the western side of the North American continent, with the Pacific Ocean stretching along its entire western coastline. The Pacific Ocean is the largest and deepest ocean in the world, covering around one-third of the Earth's surface. Its vast expanse provides a natural boundary to the west coast of the United States, influencing its climate, economy, and overall geography.