An excellent question, Faeelin!
*points to blackboard* As you can see here, the Soviet Union expelled several million German civilians after they overran Central Europe. Konrad Adenauer's Germany ratified peace treaties with the Allies (and with the new Russian Federation) which forever renounced all claims to Memel, the Sudetenland, Austria, and nearly all of Silesia. However, the Germans were slower to accept the expulsion of Germans from East Prussia and Danzig. After three years of negotiations and much behind-the-scenes bargaining, Germany and Poland reached the separate Prussian Accords. Poland was allowed to keep East Prussia and Danzig (although some adjustment of the borders with Lithuania and Belarus were made), as an autonomous area. Germany was granted some extraterritorial rights in the former East Prussia.
While we're discussing changes to the map, you may want to examine the Middle East here, to look at the Republic of Israel-Palestine. As you can see, the nation has been divided into a number of cantons on the Swiss model. Several European states, in the wake of the dark revelations about Nazi atrocities, have also taken care to ensure the civil rights of their Jewish minorities. France and her former pupil state of Italy have led the way, with model civil rights statutes that were widely copied, especially by the Ukraine, which along with Israel-Palestine and the United States is a major center of Judaism.
Civil rights- that reminds me. Joe Kennedy, like most of the war hero presidents to come (such as G.H.W. Bush, 1976, and Bob Dole, 1980), ran as a Republican. To pass his sweeping 1963 Civil Rights Act, Kennedy relied heavily on the support of Lyndon Baines Johnson, Senate Majority Leader. Johnson's ambitions for the presidency died in 1963, as the Democrats shattered on the rock of civil rights into northern and southern wings. In 1986, the split was finalized when the New Democrats (the liberal northern wing) merged with the Green Party. The southerners kept the Democratic name, forming a conservative populist party. The Republicans remain pro-business and pro-civil rights, largely because Southern Baptists never bolted the Democratic Party in this world. The Republicans and Democrats each hold approximately 45% of Congress, and the Greens a crucial 10%.
Over here, it hardly need be said, the US never withdrew from the Kyoto treaty.