Crossroads of the American Revolution National Heritage Area Act of 2003

Designates the Crossroads of the American Revolution Association, Inc. as the Area's management entity. Directs the Association to submit, and to assist local governments, regional planning organizations, and nonprofit entities in implementing, an area management plan which includes strategies for conservation, funding, management, and development of the Area.

Bars the Association from using Federal funds received under this Act to acquire real property, but permits the Association to use any other source of funding, including other Federal funding, intended for the acquisition of real property. Limits Federal funding to 50 percent of any assistance provided.

Authorizes the Secretary of the Interior to provide assistance to: (1) the Area to develop and implement the management plan; and (2) State or local government or nonprofit organizations for treatment of historical objects or structures eligible for listing on the National Register of Historic Places. Authorizes the Superintendent of Morristown National Historical Park to provide operational assistance supporting implementation of the management plan to public and private organizations within the Area, including the Association.