Delaware
New Hampshire
By ratifying the US Constitution.
Virginia
Each state held its own ratifying convention
Virginia
The framers were able to bypass congress and state legislature in the process of ratifying the new constitution because there are two methods of ratifying and they choose the one that bypasses congress. All they had to do is have the people vote on ratification and get a majority vote.
North Carolina
Yes: 6 February 1788, the date of ratifying the constitution.
On April 28,1788 it became the 7th State through the process of ratifying the US Constitution.
The plan was to go directly to the voters to get them to approve of the Constitution. The Constitution would be presented to special ratifying conventions in each state, rather than to the existing state legislatures. Delegates to the conventions would be elected by popular vote for the soul purpose of debating and approving the Constitution. (Source- We the People by Susan M. Leeson.)
They would not have enough state votes to pass the constitution if slavery was outlawed by it. The south would have voted against it.