I believe the answer is: "Resistance to civil government (Civil Disobedience)"
The main idea of the civil disobedience is to advocate the people to not ever let the government overrule their conscience .
He pointed Mexican–American War as one of the example because he perceived the war as an act of injustice for the people of Mexico.
The correct answer would be extensive definitions of a large number of words since this type of dictionary doesn't limit the amount of words that are in definitions.
