We're going shopping for today's Geo Quiz ... shopping for land, that is.

Now you probably know about Jefferson's "Louisiana Purchase" from France. You may also know all about "Seward's Folly" in buying Alaska from Russia.

Louisiana Purchase

But there's another strip of the United States acquired by means of the pocketbook.

And that deal was initially signed on this day in 1853, in Mexico City.

Uncle Sam acquired a strip of land that lies west of the Rio Grande and south of the Gila River in Arizona.

At $10 million dollars it didn't come cheap.

Acre for acre, this piece of real estate cost a heck of a lot more than either Alaska or French Louisiana.

But it was considered vital to get a railroad through to the Pacific.

So our question is, what was this acquisition called?