Which state walked out of the Constitutional Convention?

Only the state of Rhode Island (State of Rhode Island and Providence Plantations) refused to send a delegate to the Philadelphia Convention (later called the Constitutional Convention) because they believed the Convention was really a conspiracy to overthrow the established government. Patrick Henry would have been a delegate from Rhode Island, if they'd chosen to participate.

Of the 74 delegates invited, 55 actually attended. A few of the nation's most prominent leaders, such as Thomas Jefferson and John Jay, were absent because they were on diplomatic missions in Europe.