Millions of people across the world were involved in both wars.
to die.
Hitler
Yes, World War II did involve trench warfare, but it was not as prevalent as it was in World War I. Trenches were still used in some battles, but the war also saw the use of new tactics and technologies that reduced the reliance on trench warfare.
The Viet Nam War was similar to World War 2 but did not involve the entire world stage and forces. That is the most recent war that was anything near to being like World War 2.
Because of the weapons that they were using.
7 millions
Yes. WW1 did involve Germany for they were one of the central powers.
Greece was not involved, but Europe was.
28 July 1914
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It was a World War and few nations and only the Antarctic Continent seemed able to avoid it effects.
'Russia' was too busy to involve US into a World War I as there was a revolution in Russia at that time.