Imperialism, Progressivism, and World War I

Imperialism, Progressivism, and World War I 
You must argue how the period from 1900 to around 1930 was more detrimental than beneficial.
Do not argue that the period was both beneficial and detrimental (which, of course, it was).
Make sure you argue the side assigned to you.
Be sure to argue HOW the period was either beneficial or detrimental.
What one major issue or theme made the period either beneficial or detrimental, and for whom was it beneficial or detrimental, as well as how was it beneficial or detrimental to the nation as a whole.
In order to make your argument, you MUST use one primary source (the documents) each from Chapters 18-20 in Voices of Freedom and two examples from the lectures (at least five examples in total).