How did the original Kindle receive new books from Amazon?

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A person holds a Sony e-reader displaying text in front of a large illuminated sign reading e-book multiple times at the Frankfurt Book Fair in Germany. — e-book An e-reader on display at the Frankfurt Book Fair, Germany, 2012.

The original Kindle, released in 2007, received new e-books from Amazon through a free wireless connection. This feature was available exclusively to users within the United States at the time of its release.1