i am continually astounded at the lack of historical knowledge presented by people on this site. Didn't y'all go to school?
in 1776 we had neither the ability nor the desire to get involved with the political situations in other countries. In fact we were still technically a British colony
I thought everyone knew that
To say we in 1776 took on the responsibility to bring free speech to the world is absolutely ludicrous
If you like, I will be happy to start your education of American History - it is clearly lacking.
I suggest you start with the Declaration of Independence, with particular emphasis on paragraph 2. However, you must read it in its entirety to understand the intent, and content, of paragraph 2.
When you're done with this, you should move on to the writings of Thomas Jefferson,. Although a review of the Federalist papers,
The Federalist Papers Summary | GradeSaver, probably would serve you best prior to delving into Jefferson.
When you're done with all that, I suggest the following:
Why the United States Should Spread Democracy - Harvard - Belfer Center for Science and International Affairs, an excellent treatise on spreading democracy from Harvard University, though not time specific.
http://www.choices.edu/about/documents/usrole_futures.pdf, and interesting discussion about the US role in the world.
If you wish to start slow,
http://www.c3teachers.org/wp-content/uploads/2015/09/NewYork_8_American_Expansion.pdf, a NY state guide on social studies for 8th graders about expansionism.
But, please - do not bother me with one sentence pulled out of one reference, without context. Either read them all or just don't read any. In order to have an intelligent discussion, you need to have an adequate foundation.