More on Imperium in Imperio from Infoplease:

• Imperium in Imperio - Imperium in Imperio A government independent of the general authorised government. Source: ...
• states' rights: Bibliography - Bibliography See C. Warren, The Supreme Court and Sovereign States (1924); F. L. Owsley, State ...
• Federalist No. 15 - To the People of the State of New York.
• Dictionary of Phrase and Fable: I - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "I"