What are some changes to the traditional system of government during the Enlightenment?

I have to write an essay on the changes to the traditional system of government and need some help finding some of the changes.

There was a change from the feudal system, where life was centered around a king towards nationalism:

http://www.hyperhistory.net/apwh/essays/cot/t2w26nationalism.htm

http://www3.northstar.k12.ak.us/schools/tan/lite/pol/pol.html

Here's some more information from Wikipedia:

http://en.wikipedia.org/wiki/Age_of_Enlightenment

Hope this helps!

UPDATE:

http://aam.govst.edu/projects/pduignan/