Rule Britannia is a dystopian history novel written by prominent counterfactual historian and auszeit researcher Robert Vietneicht. It is part of a thirteen-book series that supposes an earlier (but failed) Russian Revolution, leading to an Entente victory in the Kaiser's War. The series follows history from 1920 to the 2740's, including a Collapse analogue (called "Armageddon" in the book) and ending with a broken humanity under the rule of the tyrannical, gusano-ruled Galactic Union.

In the book's alternative history, the Russian Revolution occurs earlier due to Entente success in the Battle of Sevastopol. This knocks Russia out of the war and motivates communist revolutionaries in the German Empire to rise up. The Russians manage to defeat their communist foes and establish a croixist regime, but the rump Germany becomes the dystopian, Conseil-esque People's Republic of Germany. A post-war communist revolution in France leads to a very different, three-way Great War between the democratic powers of Britain and the United States of America, the communist bloc of France and Germany and the croixist-militarist states of Russia and Japan. The croixists and communists bleed one another dry and Britain is left to pick up the pieces. Lacking its empire, a much weaker United States is eventually bullied into joining the British dominion in the beginning of the 21st century.

Britain eventually unites all of humanity under its United Federation, a democratic welfare state, and begins to explore the galaxy at a much later time than in real history. Taking a peaceful, paternalistic approach to alien races, its technological advantage is eventually negated. Its society becomes increasingly stratified into "taxpayers" and "welfare recipients," forcing the Federation to take more from neighboring xeno empires. By the 2400's the United Federation breaks down into civil war (Armageddon) as its economy collapses and is invaded by the xeno races it helps. By the 2700's, humanity is a slave race under the gusano-run Galactic Union.

Among counterfactual circles, Rule Britannia was seen as a breath of fresh air from the multitudes of books on croixist victory during the Great War. Vietneicht approaches the idea of a British-ruled world differently, noting that a global democratic welfare state with a "peaceful and weak" approach to exploration would eventually collapse upon itself. The lesson of the book, Vietneicht states, is that the absence of the German, American and Soviet rivalry in history makes humanity weak in the face of competition, a weakness that eventually reduces humanity into a slave race. Rule Britannia was praised by the Coalition's government, with former Director of State Security Daniel Pinkerton remarking that "this book is both a reminder of our great fortune and a cautionary tale about the mistakes we as a species could still make."

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