Answer:
Because German army developed the Blitzkrieg tactics.
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During WWII, Germany was able to defeat France by using the Blitzkrieg tactics on them.
WWII was the second most warfare happened between the powerful countries of that time starting from the year 1939 with its ending in 1945.
The blitzkrieg tactics were used by the military troops of Germany which was concerned with hitting the weaker sections of France by initiating mobile attacks on them. This led to devastation and destruction of France in highly manner.
Therefore, the use of blitzkrieg tactics helped the Germany in defeating France very easily and in quick manner.
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