Long, Norton E. "What If Napoleon Had Not Sold Louisiana? (1803)."
Divergence: 1803 CE
What if: Napoleon did not sell Louisiana to the US, and it was captured by the British during the Napoleanic wars.
Comments: Speculation that Lousiana would have remained British/Canadian territory, and Texas and California Mexican, thus aborting US superpowerdom.
Published: In What If? Explorations in Social-Science Fiction (ed. Nelson W. Polsby), q.v.