North America is a continent in the Earth's northern hemisphere and almost fully in the western hemisphere. It is bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the southeast by the Caribbean Sea, and on the south and west by the North Pacific Ocean; South America lies to the southeast, connected to North America by the isthmus of Panama.
When Europeans traveled to North America, they discovered it was inhabited by creatures long extinct in the Old World. The most important of these were the sims, a species of creatures that resembled human beings, but were very primitive. The Europeans found themselves in conflict with sims, especially as many people left Europe to start a new life.
North America was colonized primarily by Britain throughout the 17th and 18th centuries. Concurrently, the British monarchy had grown increasingly absolutist, sparking a steady stream of emigrants. In the mid-18th century, the English colonies had had enough of England's tyrannical rule, and rebelled, becoming the Federated Commonwealths of America in 1761.
In a number of alternates explored by Crosstime Traffic, North America's history and geography had radically altered, depending on the break point. In one, the Vikings had completely settled North America. In another, China had. In another, Old World civilizations had developed later, and so Native American cultures were the most advanced.
In one alternate visited by Crosstime Traffic, North America was divided up among many small countries rather than three large ones. In this alternate, the United States had not adopted the Constitution, and the country failed by the end of the 18th century, with each individual state becoming an independent country. The countries that would have been Canada and Mexico followed a similar pattern.
In an alternate where the Great Black Deaths killed 4/5 of Europe's population, North America (as it was known in the home timeline) went uncontacted by the Old World for centuries. During the 21st Century, both the Christians of Northern Europe and the Muslims of Southern Europe and North Africa discovered the land beyond the ocean and found that its natives, in their Bronze Age, could not stand against muskets and cannon. Both Christians and Muslims were on the point of starting colonization but had not yet seriously embarked on it. On reaching the Home timeline and flying off to the United States, the young soldier Jacques from the Kingdom of Versailles realized that in this timeline, the process of conquest and colonization had been carried out long ago.
At the end of the Great War, Canada was conquered by the United States, and ceased to exist as an independent nation. The Republic of Quebec was granted independence.
After the Second Great War, the United States occupied the entirety of the Confederate States. The Confederate state of Texas seceded from the C.S. as it was in its death-throes, and became a republic.
North America was attacked by the Race's Conquest Fleet in 1942. Mexico was quickly subdued, but the Anglophone countries were able to fight off the invaders. The United States became the main power on the continent, with Canada in its sphere of influence.