From the National Archives:
“It took 10 months for the first nine states to approve the Constitution. The first state to ratify was Delaware, on December 7, 1787, by a unanimous vote, 30 - 0. The featured document is an endorsed ratification of the federal Constitution by the Delaware convention. The names of the state deputies are listed, probably in the hand of a clerk. The signature of the President of Delaware’s convention, Thomas Collins, attests to the validity of the document, which also carries the state seal in its left margin. Delaware’s speediness thwarted Pennsylvania’s attempt to be first to ratify in the hope of securing the seat of the National Government in Pennsylvania.
The first real test for ratification occurred in Massachusetts, where the fully recorded debates reveal that the recommendation for a bill of rights proved to be a remedy for the logjam in the ratifying convention. New Hampshire became the ninth state to approve the Constitution in June, but the key States of Virginia and New York were locked in bitter debates. Their failure to ratify would reduce the new union by two large, populated, wealthy states, and would geographically splinter it. The Federalists prevailed, however, and Virginia and New York narrowly approved the Constitution. When a bill of rights was proposed in Congress in 1789, North Carolina ratified the Constitution. Finally, Rhode Island, which had rejected the Constitution in March 1788 by popular referendum, called a ratifying convention in 1790 as specified by the Constitutional Convention. Faced with threatened treatment as a foreign government, it ratified the Constitution by the narrowest margin (two votes) on May 29, 1790.” https://www.archives.gov/education/lessons/constitution-day/ratification.html
Yeah, looks like they voted to enshrine slavery all right. As if there was any doubt.
It's worth noting that at least two of the four States mentioned reserved the right of secession, in writing, when they ratified the Constitution...