Your question lacks specificity, so it is impossible to answer other than to say that Germans have been involved in nearly every domain of science, politics, art, culture, literature, psychology, and medicine--and were very involved in key historical events of the 20th century.
German Americans.
They got in the war because German ships sunk U.S cargo ships
Japan's involvement in WWI was almost entirely battling German colonies in China, and in the peace talks and Versailles treaty it was decided that Japan would take control of the German colonies in Shandong. - j
Lenin agreed to the Treaty of Brest-Litovsk to end Russia's involvement in World War 1.
Adolf Hitler was most known for his involvement in the Nazi Party which was formally known as the German Worker's Party. He supported anti-communism, antisemitism, and unity of the German-speak also called Pan-Germanism.
There were only TWO countries to talk to in Europe, in 1941...Britain and Russia (USSR). France was German territory.
Involve is the verb form of involvement.
Involvement is a singular noun, e.g. America's involvement in WWII was decisive; their involvement in the robbery was proved beyond a doubt.
Canada strongly condemned German aggression and supported efforts to combat it during World War II. The country actively participated in the war effort, contributing troops, resources, and support to the Allied cause. Canada's involvement helped to push back against German aggression and ultimately played a significant role in achieving victory.
US Medal of Honor recipient Colonel Charles Lindbergh was awarded the German equivalent of it by the Nazis prior to US involvement in WWII.
The sinking of the civilian ship Lusitania by a German U-boat (submarine) which had US civilians on it angered them to becoming involved against the Germans.
The German U-Boat--sinkings of the Lusitania and numerous cargo/merchant vessels even just off our coast lead to US involvement