Answer:
spurred the Germans to strategically retreat to the Hindenburg Line in March 1917 rather than continue battling over the same land that spring
Explanation:
history
The united states expanded during the progressive era by limiting trade with other nations.
<h3>What do you mean by progressive era?</h3>
In US history, the period from the 1890s to 1920 is referred to as the progressive era, an era of intense social and political reforms that aimed at making progress towards a better society.
Federal immigration policies in the Progressive era includes Immigration act limited immigration and excluded all Asian immigrants.
Therefore, B is the correct option.
Learn more about the Progressive era here:
brainly.com/question/17162211
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