Amid the ravages of economic depression, Germans in the early 1930s were pulled to political extremes both left and right. Then, in the spring of 1933, Germany turned itself inside out, from a deeply divided republic into a one-party dictatorship. In Hitler's First Hundred Days, award-winning historian Peter Fritzsche offers a probing account of the pivotal moments when the majority of Germans seemed, all at once, to join the Nazis to construct the Third Reich.

We think we know what an autocratic state looks like: There is an all-powerful leader at the top. He controls the police. The police threaten the people with violence. There are evil collaborators, and maybe some brave dissidents. But in the 21st century, that bears little resemblance to reality. Nowadays, autocracies are underpinned not by one dictator, but by sophisticated networks composed of kleptocratic financial structures, surveillance technologies, and professional propagandists, all of which operate across multiple regimes, from China to Russia to Iran.

For Americans, World War II began in December of 1941, with the bombing of Pearl Harbor; but for Poland, the war began on September 1, 1939, when Hitler's soldiers invaded, followed later that month by Stalin's Red Army. The conflict that followed saw the debut of many of the features that would come to define the later war-blitzkrieg, the targeting of civilians, ethnic cleansing, and indiscriminate aerial bombing-yet it is routinely overlooked by historians.

A sweeping history of the fortune seekers, adventurers, despots, and thieves who have ruthlessly endeavored to extract gold, diamonds, and other treasures from Africa and its people.

In 1929 Stalin launched his policy of agricultural collectivization - in effect a second Russian Revolution - which forced millions of peasants off their land and onto collective farms. The result was a catastrophic famine, the most lethal in European history. At least five million people died between 1931 and 1933 in the USSR. But instead of sending relief, the Soviet state made use of the catastrophe to rid itself of a political problem.

With the end of the Cold War, the victory of liberal democracy was thought to be absolute. Observers declared the end of history, confident in a peaceful, globalized future. But we now know this to be premature. Authoritarianism first returned in Russia, as Putin developed a political system dedicated solely to the consolidation and exercise of power. In the last six years, it has creeped from east to west as nationalism inflames Europe, abetted by Russian propaganda and cyberwarfare.

Empire of the Summer Moon spans two astonishing stories. The first traces the rise and fall of the Comanches, the most powerful Indian tribe in American history. The second entails one of the most remarkable narratives ever to come out of the Old West: the epic saga of the pioneer woman Cynthia Ann Parker and her mixed-blood son, Quanah, who became the last and greatest chief of the Comanches.

In 1990, a country disappeared. When the Iron Curtain fell, East Germany ceased to be. For over forty years, from the ruin of the Second World War to the cusp of a new millennium, the German Democratic Republic presented a radically different Germany than what had come before and what exists today. Socialist solidarity, secret police, central planning, barbed wire: this was a Germany forged on the fault lines of ideology and geopolitics. Acclaimed historian Katja Hoyer sets aside the usual Cold War caricatures of the GDR to offer a kaleidoscopic new vision of this vanished country.

Ukraine is currently embroiled in a tense fight with Russia to preserve its territorial integrity and political independence. But today's conflict is only the latest in a long history of battles over Ukraine's territory and its existence as a sovereign nation. As the award-winning historian Serhii Plokhy argues in The Gates of Europe, we must examine Ukraine's past in order to understand its present and future.

The Gulag - a vast array of Soviet concentration camps that held millions of political and criminal prisoners - was a system of repression and punishment that terrorized the entire society, embodying the worst tendencies of Soviet communism. In this magisterial and acclaimed history, Anne Applebaum offers the first fully documented portrait of the Gulag, from its origins in the Russian Revolution, through its expansion under Stalin, to its collapse in the era of glasnost.