The Boll Weevil is a bug that likes chomping on cottonseed. It made it to the US in 1892 and proceeded to destroy the cotton industry over the next few decades. Of course, the cotton industry has an infamous place in US history thanks to its heavy use of slave labor. So, if the Boll Weevil had arrived in 1792 instead of 1892, would it mean much less slavery with all the repercussions that entails (no civil war, probably a more industrialized and less politically isolated south, no Jim Crow, and a much smaller black population)?