The R.U. was founded in 1801 after the collapse of the United States of America, and consisted of the former northern states of the USA, the south having seceded. By 1805, the nation's government, a consulate based on the French revolutionary and Ancient Roman systems of government, was fully established.
The nation was founded as a stable democracy. In 1812, the RU joined the War of 1812 in an effort to invade and annex Canada. The plan failed miserably, and the RU blamed the Southron nations and the French Empire for throwing them under the bus.
Throughout the 19th century, the RU would evolve into a fascist dictatorship, eventually being transformed into the New United States of America.
The R.U. came into being in 1801 after the hanging of US President John Adams and Vice President Alexander Hamilton for treason, due to their vote rigging and the disastrous Franco-American War. The chaos surrounding the Adams Administration triggered mass secession, with the independent states of Virginia, Maryland, Carolina, Georgia, and Vermont forming in the aftermath. The rest of the old United States formed the Republican Union of America.
In the aftermath of the secession, the RU got dragged into the War of 1812 by a combination of French bullying and their own desire to annex parts or all of Canada. The resulting conflict changed the RU forever. Under the command of Generals Drummond and MacDonald, the British forces in Canada subjected the RU to the most brutal invasion in modern history up to that point. Boston and New York City were almost razed to the ground, and dozens of towns were slaughtered by the British forces. Although the RU forces eventually managed to rout the Canadians, the damage had been done.