Answer:
Progressive Era
Explanation:
The period of US history from the 1890s to the 1920s is usually referred to as the Progressive Era, an era of intense social and political reform aimed at making progress toward a better society.
External criticism is very important when it comes to analyzing data, because as a researcher it is possible to get too "close" to the data, in that one can stop being objective and start looking for ways to match the data to the desired results.
