The Commonwealth of America is a large, prosperous nation occupying much of the eastern half of the North American continent. Rich in natural resources and tracing its roots back to English colonization in the 17th century AD, America has always had a history of being a leader in trade and commerce linked to its strong bond with its mother country, Great Britain. Aside from a short period in the late 18th century marked by heated tension between the two and highlighted by the brief North American Rebellion of 1775-78, America and Britain have long had a close and mutually beneficial relationship, both in matters of trade and war. Slavery, which had been an integral part of the colonial economy but had been declining since the turn of the century, was officially abolished in 1833 by an act of the British parliament.
The CA was granted commonwealth status on 4 July 1852, effectively gaining complete control of its own affairs and achieving sovereignty in all but name. To this day the Fourth of July, or Commonwealth Day, is observed as a national holiday marked by parades, firework displays, and block parties celebrating the anniversary of America's self-determination as well as its close relationship with Britain.
America's first major military conflict as its own entity was its war with the Mexican Empire from 1869-72. With poorly defined boundaries and a lack of treaties to demarcate the borders of the resource-rich American West, skirmishes between Mexican-French and American settlers led to a full-blown war that also dragged France and Britain into a limited naval engagement in Europe on behalf of their former colonies. The war ended in a tenuous stalemate, although Mexico ended up with the lion's share of territory in the North American west.
The following decades were ones of peace and prosperity for the CA, as the nation benefited tremendously from the leverage its vast natural resources gave it in the global commonwealth. America soon became a world leader in commerce and trade, overshadowed only by Britain in terms of national wealth and scope of prominence on the global stage. While providing financial and moral support to Britain and the Allied forces during the First Great War, however, America remained officially neutral throughout the conflict at the behest of its pacifist Prime Minister Eugene Debs and his Labour government.
The interwar period was initially a prosperous one for America and the world at large until the Stock Market Crash of 1940 flung the planet into the depths of a worldwide depression. America was hit particularly hard, being a global financial powerhouse that suddenly found itself unable to collect on foreign debts owed to it. The country was subsequently gripped by strong anti-capitalist sentiment and many Americans of the time turned to socialist and communist ideologies. As the Soviet Union grew stronger and more powerful under the leadership of Joseph Stalin, emerging as a threat to the interests of Commonwealth nations and Western Europe, citizens with radical left-leaning views were imprisoned under the Sedition Acts of 1947.
With the world economy still struggling and the Soviet Union on the verge of bankruptcy, Stalin launched a desperate invasion of Eastern Europe on 12 April 1950, quickly rolling over the unprepared and ill-equipped nations of Poland, Czechoslovakia, Hungary, and Romania. These acts of aggression prompted a declaration of war by Britain, France, and the Weimar Republic of Germany whose armies managed to temporarily halt the Soviet advance near Berlin. America was initially hesitant to enter the war, hoping to avoid it as they did thirty five years prior, but its obligations to the Commonwealth along with increased Russian attacks on its shipping and transatlantic air routes edged America closer and closer to war. A sneak attack conducted by Soviet bombers on the American fleet at Key West on December 7, 1951 officially brought the CA into the war on the allied side. A subsequent attack on the cities of the American East Coast a few weeks later was largely thwarted by the vigilant efforts of Commonwealth of America Air Corps alongside the Royal Air Force and Royal Canadian Air Force, all of whom had learned from their prior engagements with the Soviets. The ill-conceived attempt to bomb America's largest cities was the last attempted Soviet attack on CA soil of the war, as the Red Air Force was recalled to Europe to pummel the European allies into submission.