Final answer:
Delaware, Connecticut, and New Jersey were three states strongly in favor of the new Constitution due to the equal representation and protection they would receive under a strong federal government.
Step-by-step explanation:
The three states strongly in favor of the new Constitution, later known as the United States Constitution, were Delaware, Connecticut, and New Jersey.
These smaller states quickly ratified the Constitution because they stood to benefit from the protection of a stronger federal government and equal representation in the Senate, which gave them a degree of parity with larger states.
Delaware was the first to ratify the document, showing its strong support. Likewise, Connecticut ratified it early in 1788. New Jersey also displayed strong favoritism towards the Constitution by ratifying it within a few months after it was proposed.