The main contribution of William Paterson was to protect the rights as well as look after the small states.
Step-by-step explanation:
William Paterson was the person who started the New Jersey Plan. His main aim was to help the small states to protect their rights. According to this plan in the Congress each state must be having equal representative. He was not ready to accept the proportional representation because he always feared that the small states will be ignored their interest will not be given any priority.
As his proposal was not accepted so he made decision to leave the convention in the end of July but later returned in September when his proposal was accepted and he signed the constitution.