State Departments of Contractors Licensing and Regulation Links
It should be noted that each state operates differently, and many of them do not require contractor licensing at the state level. Some states regulate general contractors at the city or county level.
Each link listed below should direct you to a state department which may be able to answer specific questions with regard to the states policies pertaining to contractors. Ultimately it is up to you to gather any specific information with regard to the potentially changing laws and departments pertaining to contractors.
* New York