In late February 1776, Americans learned that the British Parliament had passed the Prohibitory Act, which declared that all American shipping was subject to seizure by British ships. Unlike many other congressional leaders, Morris continued to hope for reconciliation with Britain, since he believed that all-out war still lacked the strong support of a majority of Americans and would prove financially ruinous. In June 1776, due largely to frustration with the moderate faction of Pennsylvania leaders that included Morris, a convention of delegates from across Pennsylvania began meeting to draft a new constitution and establish a new state government. At the same time, Congress was debating whether to formally declare independence from Britain. By early July 1776, Pennsylvania's delegation was the lone congressional delegation opposed to declaring independence. Morris refused to vote for independence, but he and another Pennsylvania delegate agreed to excuse themselves from the vote on independence, thereby giving the pro-independence movement a majority in the Pennsylvania delegation. With Morris absent, all congressional delegations voted to pass a resolution declaring independence on July 2, and the United States formally declared independence on July 4, 1776.