Humanity’s first tentative steps off its homeworld leads to political upheavals and the founding of great interstellar empires. War is the inevitable result as these nations clash over resources and territory. An awesome and terrible new invention—the BattleMech—changes the face of warfare forever.
The League flourishes under the rule of the First Lords for two hundred years. Technology advances at a prodigious speed and billions enjoy peace and prosperity. Yet a darkness grows within the realm and Ian Cameron’s original sin bears fruit as the Periphery nations rise in revolt.
Minoru Kurita of the Draconis Combine declares himself the new First Lord of the Star League, sparking the First Succession War and drawing all of the Great Houses into conflict. Massive loss of life and technology ensues, due to the liberal use of weapons of mass destruction by all powers. Though the war ends with an uneasy truce, a Second Succession War begins less than a decade later and leads to even more destruction.
By this time, the Second Succession War and the beginnings of the Third have reduced most of the advanced technology of the Star League to the status of ’lostech”. The Third war begins with a Draconis Combine attack on the Lyran Commonwealth but soon descends into two hundred years of low-level and constant warfare as the Great Houses suffer the consequences of their folly.
In the early 31st century the Grey Death Legion discovers the Helm memory core and kickstarts the rediscovery of many lost technologies. In secret Hanse Davion and Katrina Steiner sign the FedCom Accords, a secret pact to join the Federated Suns and Lyran Commonwealth. Using his marriage to Melissa Steiner as cover, Hanse Davion begins the Fourth Succession War by launching a massive invasion against his enemies. The war ends with Davion capturing half of the Capellan Confederation and securing a vital link to the Commonwealth, but fails to defeat the Draconis Combine.
A mysterious invading force strikes the coreward region of the Inner Sphere. The invaders, called the Clans, are descendants of Kerensky’s SLDF troops, forged into a society dedicated to becoming the greatest fighting force in history. With vastly superior technology and warriors, the Clans conquer world after world. Eventually this outside threat will forge a new Star League, something hundreds of years of warfare failed to accomplish. In addition, the Clans will act as a catalyst for a technological renaissance.
The Clan threat is eventually lessened with the complete destruction of a Clan. With that massive external threat apparently neutralized, internal conflicts explode around the Inner Sphere. House Liao conquers its former Commonality, the St. Ives Compact; a rebellion of military units belonging to House Kurita sparks a war with their powerful border enemy, Clan Ghost Bear; the fabulously powerful Federated Commonwealth of House Steiner and House Davion collapses into five long years of bitter civil war.
Following the Federated Commonwealth Civil War, the leaders of the Great Houses meet and disband the new Star League, declaring it a sham. The pseudo-religious Word of Blake—a splinter group of ComStar, the protectors and controllers of interstellar communication—launch the Jihad: an interstellar war that will ultimately pit every faction against each other and even against themselves, as weapons of mass destruction are used for the first time in centuries while new and frightening technologies are likewise unleashed.
Stone’s Republic leads the way into peace and prosperity in the aftermath of the Jihad. Conflicts still occur, but they are small in scale and the massive wars of the past are not seen.
Two years after Stone’s disappearance, the communications network goes dark. Capitalizing on the confusion, the Great Houses begin taking back the worlds they once gave to the Republic as long-standing hatreds spark to life once more.