In 1791, Delaware convened a convention to revise its existing Constitution, which had been hastily drafted in 1776. Dickinson was elected president of this convention, and although he resigned the chair after most of the work was complete, he remained highly influential in the content of the final document. Major changes included the establishment of a separate Chancery Court and the expansion of the franchise to include all taxpayers, except blacks and women. Dickinson remained neutral in an attempt to include a prohibition of slavery in the document, believing the General Assembly was the proper place to decide that issue. The new Constitution was approved June 12, 1792. Dickinson himself had freed his slaves conditionally in 1776 and fully by 1787.