Compared to other European countries, Germany is relatively new. Prussia and other kingdoms were unified under a man named Otto van Bismark. Of course, Bismark wasn't immortal so it eventually fell into Wilhelm II's hands.
Early 20th century
Archduke Franz Ferdinand is not assassinated. As a result, Austro-Hungary does not start World War 1. Overall, Germany had a stable economy and a military which rivaled that of the Entente powers. The panic of 1929 caused an economic downturn but wasn't as bad as the OTL great depression. In 1937, a large German-made Zeppelin has a hydrogen leak and catches fire, ending the era of the airship. In the late 30s, Germany began development of project Berlin. The project centered around a bomb which used nuclear fission to create an explosion big enough to devastate an entire city. Fission involves splitting atoms cuasing some pure energy, an idea proposed by Albert Einstein, the inventor of the famous equation, e=mc2. Ironically, Einstein opposed the creation of such a weapon, seeing it as the Pandora's Box of humanity. In 1943, the weapon was tested over the plains of Namibia. The test was so successful that more uranium was mined from Namibia to create a nuclear arsenal (Namibia has lots of uranium). Germany then threatened Belgium demanding unconditional surrender and the transfer of the Congo. Naturally, Belgium did not respond so a bomb was dropped on Liege. The country surrendered just two days later. This struck fear into the Entente as Germany now had a really powerful bomb. On top of that, the Germans were developing rocket technology. Germany's nuclear monopoly didn't last forever as Britain, France and Russia all obtained nuclear technology by the end of the fifties. In 1965, talks were held in Geneva, Switzerland and there, the non-proliferation treaty was signed limiting the distributing and manufacture of nuclear weapons.
In 1965, unrest in the Austro-Hungarian empire began. As in the 20s, Germany sent troops to quell the unrest. This led to a very long, brutal civil war which led to many casualties. The war was unpopular with the general public as they saw it as a gambit by the rich. There were many antiwar slogans tossed around until 1972 when they withdrew from the Balkans. Two years later, Austro-Hungary was split into Yugoslavia, Czechoslovakia and Romania - not to mention Austria and Hungary. The result were protests calling for better representation of the middle class and better democracy. This led to a few acts which made reforms since the German government didn't want the same fate as the Austro-Hungarian empire.
End of hostilities
Over the course of the seventies, tensions with the Entente cooled down a bit. In 1976, the outer space treaty is ratified, prohibiting the militarization of space. Over the course of the seventies and eighties, Germany, UK, France, US and Russia each launch at least one space station which is very small (Germany's was the biggest, having the same layout as the Skylab from OTL). In the late 80s, Germany built a space station called the Friedan (German for peace) as offering to the other space programs. This station was much larger than those before it as it had to be launched in pieces rather than one piece. It took ten years to finish starting on 1983 and lasted five more years before finally de=orbiting in 1998.
In the 90s, Europe finally decides to begin decolonization. In 1993, The League of Nations and European Union are founded by the four powers of Europe: Germany, Russia, Great Britain, and France. Two years later, Belgium says "yes" to independence.
Not much is going on in Europe other than the same effects of the 2008 financial crisis as in OTL. There is no migrant crisis or protectionism making Europe mostly better off.