How did the ancient government of Greece and Rome influenced the system of laws in the modern day United States?
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Even though this is a lesson plan, you can get many ideas out of the long list that is given.
http://en.wikipedia.org/wiki/Ancient_Rome In a long article like this, press Ctrl and F (for "find) and then type in a word. I typed in "influence" (without the quotation marks!) and easily found several places with good information.