Quoddy Head State Park in Maine is the closest place in the US to Africa.

As surprising as it may sound, the point in the United States closest to
Africa is not somewhere on the sunny Florida coast. Instead, Quoddy Head
State Park in Maine is the closest place in the US to Africa. Quoddy Head
State Park is about 3,100 miles (5,074 kilometers) from the western coast
of Africa. The closest point in Africa to the United States is Safi
Province, Morocco, with Cape Bojador, Western Sahara, as a close second.