The New Jersey Plan was mainly supported by the smaller states at the Constitutional Convention, especially New Jersey, New York, Delaware, and initially Connecticut, along with at least one key delegate from Maryland (Luther Martin).

Core answer

  • The states most clearly associated with supporting the New Jersey Plan were:
    • New Jersey.
* New York.

* Delaware.

* Connecticut at first, before its delegates helped move toward a compromise.

* One Maryland delegate, Luther Martin, who sided with the small‑state position.

These were all smaller or less populous states that feared losing influence under the population‑based Virginia Plan, so they backed a proposal that kept one vote per state in the national legislature.