Where Pennsylvania went, little Delaware could not be far behind. The two were almost one province, having the same proprietary governor. Delaware, too, had retained its old assembly and governmental structure after Lexington and Concord. Its three delegates to the Continental Congress were Thomas McKean, a radical; George Read, an archconservative; and Ceasar Rodney[sic], a centrist. By the end of 1775, Rodney had shiftedleftward, winning the delegation for the American cause. Pennsylvania's opting for independence quickly convinced Delaware. On June 14, McKean presented to the Delaware Assembly the May 15 resolution of Congress along with the recent resolutions of Pennsylvania. On June 15, Delaware removed the restrictions that prohibited its delegates from voting for independence, which had been in force since March 1775, when the delegates were instructed to aim for reconciliation with the mother country. Now, in imitation of the Pennsylvania Assembly's resolve of June 8, the Delaware Assembly ordered its delegates to concur with other delegates in favoring whatever measures may be necessary for the interest of America. The way was clear for the Delaware delegation to vote for independence.
Murray N. Rothbard, "The Struggle in Pennsylvania and Delaware," ch. 31 of Pt. IV of Conceived in Liberty vol. 4 (Arlington House, 1979), pp. 168–169. Cf. ch. 33, p. 177 for Delaware's actual role in passing the Resolution for Independency on 2 July 1776.