'For Want Of A Nail: If Burgoyne Had Won At Saratoga'

[Evolution of the United States of Mexico and the Confederation of North America.]

I rarely read alternate history; this 1973 novel is probably my first such book in twenty years.

Its thesis is that the American Revolution failed and England as victor proceeded to dominate the world from that point forward, with the narrative tracking from around 1750 to 1950, a representative world map appearing above.

Quite fascinating,