The bone of the arm (humerus) meets both the ulna (the inner bone of the forearm) and radius (the outer bone of the forearm) to form a hinge joint at the elbow. The radius and ulna also meet one another in the elbow to permit a small amount of rotation of the forearm.
The emigres were those who helped to spur on the revolution. People were tired of being poor and watching the royalty get richer without any work.
The Sons of Liberty was an underground resistance organization, that was made up of men and women (known as the Daughters of Liberty) from the New England colonies that protested the intolerable acts that the British government put on them. Paul Revere and Samuel Adams were two of the leaders.