In 1763 an anonymous Londoner published The Reign of George VI, 1900-1925, a forecast of the remote 20th century. Among other things, the author predicted that George’s greatest military victory would come before the gates of Vienna in May 1918, the actual date of Germany’s Spring Offensive of World War I:

Peter immediately raised the siege, and, drawing up his forces in the plains of Vienna, prepared to fight the King of England, who was also engaged in the same employment. The Russian army had a superiority of above sixty thousand men, consequently their numbers were two to one; but no dangers could depress the heart of George. Having, with moving batteries, secured the rear and wings of his army from being surrounded, he placed his artillery in the most advantageous manner; and dividing his front into two lines, at the head of the first he began the attack, after his artillery had played on the enemy an hour, with great success. The Russian infantry, animated by the presence of their Czar, under whom they had so often conquered, repulsed him with some loss. The King hereupon made a second and still more furious attack, but yet without success. At that critical moment the Duke of Devonshire, who commanded his left wing, sent for immediate assistance, as he was hard pressed by the superior numbers of the enemy. George flew like lightning to his weakened troops, and placing himself at the head of six regiments of dragoons, made such a furious attack on the eager Russians as threw them into disorder, and following his advantage, pushed them with great success.

Properly speaking this isn’t science fiction, as the author envisions no technological advances: Sail warships still fight naval battles; East Indiamen travel to India and Indonesia; and European nations communicate by roads and trade using river barges.

But here’s an interesting detail: “By the year 1920 there were 11,000,000 of souls in the British-American dominions [of North America]: they were in possession of perhaps the finest country in the world, and yet had never made the least attempt to shake off the authority of Great-Britain.” Writing in 1763, the author had considered the possibility of a revolt in the colonies, but rejected it: “The constitutions of the several divisions of this vast monarchy were admirably designed to keep the whole in continual dependence on the mother country. … The multiplicity of governments which prevailed over the whole country rendered the execution of such a scheme [combined rebellion] absolutely impossible.”