Hitler started world war II
Germany
Dwight D. Eisenhower .
They both ended with Germany defeated.
120 million
The Allied Powers won both world wars. (Allied Powers: Britain, America, Etc...)
One way in which WWI and WWII were similar is that they were fought by many nations of the world over a large area, unlike many other wars.
World war 1 is often characterized as a trench was, because most of the fighting took place in trenches and other fortified positions.
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England and France declared war on Germany after it invaded Poland on Sept 1, 1939.
The Western Front was characterized by trenches that ran from the Switzerland border with France to the North Sea. The front did not change much during the course of the war.
Most of World War 1 was characterized by stalemates caused by trench warfare. This caused the war to drag out for longer than expected, and casualties extended to the civilian populations of some countries.