What is the period in american history from 1901-1914 called?

http://www.u-s-history.com/pages/eras.html

1880-1920

http://americanhistory.about.com/od/erasofamericanhistory/Eras_of_American_History.htm

http://en.wikipedia.org/wiki/Category:Eras_of_United_States_history
Check on Gilded Age, but again, it's a broader time period.

so what is it the progressive era? I thought it was that but it is too obvious, to me at least.

Yes, that time period is in the Progressive Era.

http://www.americaslibrary.gov/cgi-bin/page.cgi/jb/progress

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The period in American history from 1901 to 1914 is commonly referred to as the Progressive Era. The Progressive Era was a time of social, political, and economic reform in the United States, characterized by efforts to address the social problems caused by the industrialization and urbanization of the late 19th century.

During this period, various progressive movements emerged, aiming to improve living and working conditions, promote social justice, and reduce corruption. Important issues addressed during the Progressive Era included women's suffrage, labor rights, child labor laws, conservation of natural resources, and regulation of big business.

To find the answer to your question, you can use various sources such as history books, online articles, and websites dedicated to American history. Researching the time period and reading about the major events, movements, and figures of that era will give you a comprehensive understanding of the Progressive Era in American history.