On October 10th, 1492, Christopher Columbus struck a deal with his worried crew: They'd sail on for three more days, and if they hadn't seen land by then, they'd turn around and return to Spain.
On October 12th, 1492, a sailor named Rodrigo spotted land - an island in the Bahamas.
What if Columbus had been held up a couple days during his voyage? A storm hits and delays him 48 hours. He never makes it to the New World.
What is this gigantic effect on history?