According to the American Historical Association:
Among the jobs you can consider are: advertising executive, analyst, archivist, broadcaster, campaign worker, consultant, congressional aide, editor, foreign service officer, foundation staffer, information specialist, intelligence agent, journalist, legal assistant, lobbyist, personnel manager, public relations staffer, researcher . . . the list can be almost endless.
More specifically, though, with your degree in history you can be a researcher, communicator or editor, information manager, advocate, or even a businessperson.
Here is a brief list of the career opportunities available to the undergraduate history major.
Historians as Educators:
Historic Sites and Museums
Historians as Researchers:
Museums and Historical Organizations
Cultural Resources Management
Historians As Communicators:
Writers and Editors
Producers of Multimedia Material
Historians As Information Managers:
Computer Information Managers
Historians As Advocates:
Lawyers and Paralegals
Legislative Staff Work
Historians in Businesses and Associations:
Historians in Corporations
Historians and Nonprofit Associations
Here's some organizations for historians; some provide career/job info:
The National Council on Public History (NCPH)
The NCPH strives to advance the role of public history within the historical profession and publishes the quarterly journal
The Public Historian in cooperation with the History Department of the University of California at Santa Barbara.
National Park Service
The NPS History Program is an excellent source of information for public historians.
National Register of Historic Places
Since its inception in 1966, nearly 73,000 properties have been listed in the National Register, and its vast database can be easily accessed through a research engine.
American Association for State and Local History
Through preservation and interpretation, the AASLH strives to give meaning to state and local history within American history. Its website offers research tools, job listings, and publications for its members.
The Society for the History in the Federal Government
Founded in 1979, the SHFG promotes the study and understanding of the history of the federal government and serves as its voice within American historical profession. The SHFG has an annual meeting and its website contains job listings for public historians interested in working within the federal government.
The Society of American Archivists
The SAA is North America's oldest and largest national archival professional assocation. It's website has an employment bulletin, periodicals, publications, and other information pertinent to those within the Archivist profession.
American Association of Museums (AAM)
The American Association of Museums is the national organization representing the museum community which strives to enhance the ability of museums to serve the public interest.
The Smithsonian website provides a wealth of information to historians wishing to work in the public sphere.