Harry Turtledove

"What if HIV started spreading in the early 1500s rather than the late 1900s? Without modern medicine, anybody who catches HIV is going to die. A patriarchal society reacts to this devastating disease in the only way it knows how: it sequesters women as much as possible, limiting contacts between the sexes except for married couples. While imperfect, such drastic actions do limit the spread of the disease. The 'Wasting' (HIV) has caused devasting...

A stroke of the pen and history is changed. In 1938, British prime minister Neville Chamberlain, determined to avoid war, signed the Munich Accord, ceding part of Czechoslovakia to Hitler. But the following spring, Hitler snatched the rest of that country, and England, after a fatal act of appeasement, was fighting a war for which it was not prepared. Now, in this thrilling alternate history, another scenario is played out: What if Chamberlain had...

In 1941 Winston Churchill was Hitler’s worst enemy. Then a Nazi secret agent changed everything.
 
What if Neville Chamberlain, instead of appeasing Hitler, had stood up to him in 1938? Enraged, Hitler reacts by lashing out at the West, promising his soldiers that they will reach Paris by the new year. Instead, three years pass, and with his genocidal apparatus not fully in place, Hitler barely survives a coup, while Jews...

"In 306 BC, the small, free, and independent polis of Rhodes is trying to stay neutral between the local great powers, each ruled by one of Alexander the Great's marshals: Asia Minor, controlled by one-eyed Antigonos, and the Egypt of Ptolemaios. Antigonos' son, Demetrios, comes to Rhodes seeking an alliance against Ptolemaios. The Rhodians, who trade a lot with Egypt, refuse his offer.Menedemos and Sostratos take the Aphrodite to Egypt for business......

A what-if novel that "envisions the election of a United States President whose political power will redefine what the nation is-and what it means to be American... President Herbert Hoover has failed America. The Great Depression that rose from the ashes of the 1929 stock market crash still casts its dark shadow over the country. Despairing and desperate, the American people hope one of the potential Democratic candidates-New York governor Franklin...

"What would happen if the ancient prophecy of the End of Days came true? It is certainly the last thing Eric Katz--a secular archaeologist from Los Angeles--expects to discover during what should be a routine dig in Jerusalem. But perhaps higher forces have something else in mind. For when a sign presaging the rising of the Third Temple is located in America and a dirty bomb is detonated in downtown Tel Aviv, events conspire to place a team of archaeologists...

An exciting novel of "alternate history" in which time travelers from the future alter the outcome of the Civil War. As the war is nearing its end, and General Lee is facing imminent defeat, he is approached with the offer of an extraordinary weapon--an assault rifle called the AK-47.

"Set in an alternate 1950s in which General MacArthur ignites a nuclear war that nearly destroys the planet. The third and final installment in the series that began with Bombs Away and continued with Fallout"-- Provided by publisher. 1952. American cities lie in ruins. President Harry Truman, in office since 1945, presides over a makeshift government in Philadelphia. In the wake of Hitler's reign, Germany and America have become allies, and Stalin's...

The Confederate States win the Civil War and in 1914, allied with England and France, go to war against the United States once more.

"An explosion of incalculable magnitude in Yellowstone Park propelled lava and ash across the landscape and into the atmosphere, forever altering the climate of the entire continent. Nothing grows from the tainted soil. Stalled and stilled machines function only as statuary. People have been scraping by on the excess food and goods produced before the eruption. But supplies are running low. Natural resources are dwindling. And former police officer...