[jmherbener]

Take a look at Ludwig von Mises’s book, Liberalism, section 3:

http://library.mises.org/books/Ludwig%20von%20Mises/Liberalism%20In%20the%20Classical%20Tradition.pdf

There is also his work, The Free and Prosperous Commonwealth, mentioned in this article by Leonard Liggio:

http://mises.org/daily/6461/

Here are videos of a conference on Imperialism sponsored by the Mises Institute in 2006:

http://mises.org/media/categories/94/Imperialism-Enemy-of-Freedom

Here is Joe Stromberg on American Empire:

https://mises.org/journals/jls/15_3/15_3_3.PDF