c. 65 million years ago: An asteriod at least 6 miles in diameter crashes into the landmass that would have become the British Isles, destroying the landmass and triggering a mass extinction. It lands in the OTL Liverpool area.
772-804: Charlemagne leads the Frankish conquest of the Anglo-Saxons. Anglo-Saxon land, including those in the west are annexed into the Frankish Empire.
933: The islands of Guernsey, Alderney, and Sark are annexed by the future Duchy of Normandy, combining the three islands into the Balliwick of Guernsey. Jersey is also annexed, and becomes the Balliwick of Jersey.
1803: New France declares its independence, and then splits into Louisiana and Canada, but then Canada is quickly invaded by Royalist Forces, which quickly reestablish French control over the territory.
1831: The Ten Days' Campaign successfully crushes the Belgian rebellion. As part of the Treaty of Brussels, the Netherlands decentralizes into constituent countries, among them Belgium. Flanders becomes its own constituent country, as per the Flemish's wishes to separate from the rest of Belgium.
1846: Russia and Louisiana sign the Oregon Treaty in New Archangel, settling the disputed border at the 51st parallel north.
1880s:Florida is formed from former Spanish colonies in mainland North America and the Caribbean.