"God calls people freely to offer him their obedience. Nothing is gained by imposing patterns of 'Christian' behavior on human beings whose hearts have not been turned to the Lord." -Abraham Kuyper (1837-1920); Christian History & Biography Issue 94 www.christianhistory.net
Law definitions taken from Black’s Law Dictionary, 6th Edition
Threat – “…A declaration of intention or determination to inflict punishment, loss, or pain on another, or to injure another or his property by the commission of some unlawful act. … The term, ‘threat’ means an avowed present determination or intent to injure presently or in the future.’”
Duress- “Any unlawful threat or coercion used by a person to induce another to act (or to refrain from acting) in a manner he or she otherwise would not (or would). Subjecting a person to improper pressure which overcomes his will and coerces him to comply with demand to which he would not yield if acting as free agent.”
Duress of imprisonment- “The wrongful imprisonment of a person, or the illegal restraint of his liberty, in order to compel him to do some act.”
Coercion- “Compulsion; constraint; compelling by force or arms or threat. It may be actual, direct, or positive, as where physical force is used to compel act against one’s will, or implied, legal or constructive, as where one party is constrained by subjugation to other to do what his free will would refuse.” [Government by force.]
Extortion- "The obtaining of property from another induced by wrongful use of actual or threatened force, violence, or fear, or under color of official right."
Usurpation- "The unlawful encroachment or assumption of the use of property, power or authority which belongs to another. An interruption or the disturbing a man in his right and possession. The unlawful seizure or assumption of sovereign power. The assumption of government or supreme power by force or illegally, in derogation to the constitution and the rights of the lawful ruler."