Either Europe or Africa, depending on where in the US you leave from.
Austraillia Austraillia
America is named after Amerigo Vespucci.
Africa is southeast of the US and across the Atlantic ocean.Mexico
66* to 30* north
England
Ireland is an island in the Atlantic Ocean in north-western Europe. Canada lies directly to the west of Ireland across the Atlantic Ocean. Britain lies directly to the east of Ireland across the Irish Sea. See the maps below.
Namibia in Africa
Europe and Africa
New Jersey is located directly opposite of Delaware on the Mid-Atlantic coast.
In between the western hemisphere and Asia (if you travel west) is the Pacific Ocean. If you travel east from the western hemisphere you would encounter Europe first, before you get to Asia, so Asia is not exactly across the Atlantic. But you can get to Asia directly, by going across the Pacific.
Spain