First State National Historical Park Act - Establishes the First State National Historical Park in Delaware as a unit of the National Park System.
Specifies that the purpose of the Park is the preservation, protection, and interpretation of the historic and cultural resources associated with Dutch, Swedish, and English settlement in Delaware and the resources associated with the role of the state of Delaware as the first state to ratify the Constitution.
Requires the preparation of a general management plan for the Park.
Requires completion of a study regarding the preservation and interpretation of additional properties in Delaware that relate to the Park's purposes, including an assessment of: (1) the potential for designating them as National Historic Landmarks; and (2) options for maintaining their historic integrity.