The Attempted Assassination Of John F. Kennedy — Robert Reginald

In this alternate history, George Washington becomes Lord President George I of the United States in 1789, and this action changes the course of world development: the monarchies of Europe and the New World are never displaced, but evolve into parliamentary democracies. And so, in this strange new universe, when Lord President John IV (Kennedy) travels to Dallas in 1963, the assassin's bullet misses, killing the Lord Governor of Texas instead, and Kennedy survives to serve two full terms in office!