Imperialism vs. Isolationism

The debate about the U.S.'s place in world affairs is a controversial one.  I'd like to hear what you think.  In a well-constructed response, write the following:

• define imperialism and isolationism
• provide examples of each of these within the U.S.'s history
• tell which policy you tend to agree with more and why
• support your position with a pertinent quotation from our studies