In response to your post on the South America map too, this is sposed to be modern day, after the events of both world wars and a long and bitter cold war.
In the modern day, the world's culture is far more diverse then our own, with the C.S.A., Britain, and Germany being the main cultural influences, as well as the largest military and economic powers (although by the turn of the millenium, Germany's fortunes are on the downturn - you'll see when I finally get the European map sorted out, heh), and with other nations such as the U.S.A., California, Russia, and the United Provinces (an enlarged Netherlands) all playing a part too.
WW1 was considerably different, with most American nations keeping out of the European conflicts. Even so, the C.S.A. and New England, as well as the Canadian nations, poured a lot into the conflict in Europe, which ended a year earlier than our own, with Germany slightly better off than ours. On the American continent itself, a series of conflicts known as the "Virginia Wars" bubbled away throughout WW1, which saw the U.S.A. against the C.S.A. and New England, and Dakhota and Texas allying against California, and later, Mexico.
Between the world wars, the U.S.A., New England, and the C.S.A. continued proxy conflicts between puppet nations in Central and South America, each continually supporting opposing sides in any conflict that broke out there.
At the outbreak of world war II, and the start of the Nazi march across Europe, many of these little conflicts were put on ice, and many nations mounted to aid Europe. Once again, the U.S.A. took little part in the European sphere, leaving most of the work to New England and the C.S.A.
California and Texas put much of their old differences behind them, and allied with Russia, forming the Pacific Treaty, to combat Japan's expansion. Since they were instead moored at Alaska, this timeline saw the survival of the Russian Navy, destroyed by storms in our timeline. This greatly aided in a quicker defeat of Japan.
In Europe however, the conflict was more intense than our own. The "Final Solution" was hurried through much earlier, and Britain nearly collapsed after a brutal civil war that saw the Monarchy and current government overthrown. Then, on 20th of July 1944, Hitler was assasinated. The collapse soon after of the Nazi war machine saw a quick rush to a peaceful resolution of the war; the Treaty of Paris took place in August of the same year, and saw a slightly uneasy peace descend over Europe, with Germany still holding on to many lands she had secured during the war, including much of France and eastern Europe, which Russia was not all too happy about. The outcome was good however for the newly republican Britain, which retained Greenland and Iceland, and managed to keep on to numerous colonies for many years, some of them right up till the 'modern day'.