Answer:
West:
They tend to move water toward the equator, and they are prone to strong upwelling. That's because an ocean current moving from north to south along a west coast is pulled away from the shore by Earth's rotation (the Coriolis effect), leaving a void that allows deep water to fill in behind.
East:
The east coast of the United States is affected mainly by the Gulf Stream current, which brings warm water from the tropics into higher latitudes. The warm current flows north along the coast towards Maine, before veering northeast out toward England.