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:
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The reason as to why the ethnologist focus more on non-literate
people on their study because mainly of the reason that they are going extinct.
The non-literate people are being referred to those societies in which their
people does not have the ability of being able to read and write in which the ethnologist
studies and help out of.
