Final answer:
Germany has had a monarchy, a republic, a dictatorship, a communist state, and a federal parliamentary republic over the last 100 years, showcasing the country's diverse governmental history.
Step-by-step explanation:
The country that has experienced all these forms of government in the last 100 years is Germany. Over the course of the 20th century, Germany transitioned from an empire to a republic following World War I, then into a totalitarian state under the Nazis, divided into democratic West Germany and communist East Germany after World War II, and finally reunified in 1990 as a federal republic. Germany's forms of government have thus included a monarchy during the German Empire, a democratic republic in the Weimar era, a dictatorship under the Third Reich, a communist state on the east side of the Iron Curtain, and currently a federal parliamentary republic.