What was the turning point in world war 1​

The battle of the Marne was a major turning point of World War I. By the end of August 1914, the whole Allied army on the Western Front had been forced into a general retreat back towards Paris. Meanwhile the two main German armies continued through France.

Explanation:

The battle of the Marne what was the main turning point in World War 1

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the real gdp increased by 4.1%

explanation:

might not be right, i think i'm correct, but i might be thinking of last quarter