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Africa, I think
Large parts of Mexico were taken over by the US under the doctrine that it is the manifest destiny of the US to extend its territory across the continent of North America, from sea to shining sea.
1979.
The belief that the US would naturally spread across the continent was called "Manifest Destiny" because it was thought to be the manifest (plainly visible) destiny of the US to do that.
Africa
Rift valleys tell us stuff about the sea floor.
by creating airplanes
Poland and Portugal are part of Europe. This continent is east across the Atlantic from the US and west from Asia.
North America is the continent closest to the United States.
it is the thrid
to gain land for a railroad across the continent
It enabled the united states to expand across the continent.It enable the united states to expand across the continent.