That would depend on where you are, which you didn't include in the question.
Asia (Russia) is about 100 miles from the US (Alaska)
Probably Asia which is just across the Berring straits from the US state of Alaska.
The continent of Africa lies east of the United States.
The USA is located on the North American continent which is joined to the South American. North America and Asia are separated by the Bering Strait.
Russia is closest. Siberia's easternmost point is just fifty-six miles from Alaska. Actually, in the middle of the Bering Strait, Russia's Big Diomede Island and Alaska's Little Diomede Island are only two miles apart!
Florida is the closest US State and the North American continent is the closest continent.
Asia (Russia) is about 100 miles from the US (Alaska)
Probably Asia which is just across the Berring straits from the US state of Alaska.
The continent of Africa lies east of the United States.
south america The US is part of North America. The Continent you could say would be closest to North America would be, South America.
The closest place to the southern US border is Mexico, which happens to be in North America, just like the US is. The continent that borders North America is South America.
Asia http://www.google.com/imgres?imgurl=http://questgarden.com/15/25/7/060131155305/images/k3continents.gif&imgrefurl=http://questgarden.com/15/25/7/060131155305/&h=377&w=500&sz=25&tbnid=vC7bYBgCToAwzM:&tbnh=98&tbnw=130&prev=/images%3Fq%3Dcontinents%2Bof%2Bthe%2Bworld&usg=__xdkqciu0X-X8ohKK3kr1sSd50fw=&ei=jsqlStuxJJKBnQeG--GiBQ&sa=X&oi=image_result&resnum=7&ct=image
The Gulf Stream, originating in the Gulf of Mexico, passing the US east coast, crossing the Atlantic in a northwesterly direction is responsible for the temperate climate of coastal northern Europe.
You cannot put a price on a continent. The closest thing is valuing the gross domestic product of Europe (GDP). Its GDP is about US$18,800,000,000, the largest of any continent.
East, would be the closest direction, though it is slightly south, so East by South would be a closer direction.
The USA is located on the North American continent which is joined to the South American. North America and Asia are separated by the Bering Strait.
The United States of America is 9,826,675 km2 in area. The continent closest to being three times this size is Africa, whose area is 30,221,532 km2.