First State National Historical Park Act - Establishes the First State National Historical Park in Delaware, to be administered as a unit of the National Park System.

Specifies that the purpose of the Park is the preservation, protection, and interpretation of the nationally significant cultural and historic resources associated with early Dutch, Swedish, and English settlement of the colony of Delaware and parts of the colony of Pennsylvania and Delaware's role in the birth of the United States and as the first state to ratify the Constitution.

Requires the completion of a management plan for the Park.

Requires completion of a study assessing the historical significance of additional properties in Delaware associated with the Park.