Asignificant cause of the depression that began in 1929 was that

Wall Street Crash of 1929

Explanation:

There are different economic standpoints to analyze how the Great Depression could have been managed or even avoided, however, most of the economists agree that Wall Street Crash of 1929 was the starting point of Great Depression not only in United States but also in all of the Western World. The excess of speculation on the stock market and an overproduction of produce on the agricultural sector were the leading events to the Wall Street Crash.

c) troops march forward in close formation against newer, more accurate weapons

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