As of 2013, the Minneapolis-St. Paul-Bloomington metro area holds the top ranking.
American | American Civil War | American Broadcasting Company | American football | African American | American Idol | American Revolutionary War | American Revolution | American Association for the Advancement of Science | American Red Cross | American Library Association | American Museum of Natural History | American Express | American Academy of Arts and Sciences | American League | American Association | American Heart Association | American comic book | American Institute of Architects | American Airlines | American Hockey League | Spanish-American War | Pan American Games | American Cancer Society | Whitney Museum of American Art | American Ballet Theatre | American Legion | American University | Union (American Civil War) | Scientific American |