Historians use primary sources like diaries, letters, speeches. And secondary sources like articles.
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Explanation:
shut up and use your brain
Answer:
I got you
Germanys success in the second World War can be attributed to multiable things first off the motorization of the German Wermacht. Which allowed them to advance at speeds that were never done before in modern warefare were previously it would have been done by foot. The speed also created another factor in where while invading nuetral belgium. The rate at which they advanced through the country, caused the refugees fleeing the war to overwhelmed allied Belgium, English, and French troops who were trying to counter Wermacht. This style of Warfare would be labeled the Blitzkrieg (Lightning War). Another thing allowing the German soldiers to fight over several nights in a row was the invention of pervitin which was actually methamphetamine. But for the obvious long term effects of giving soldiers meth, they had to stop this practice after the initial crossing of the Ardenne. They also were given the element of surprise and because of the memories of the first world war the french enlisted moral war quite low not to say that any of them didnt fight very hard.
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