American Heart Association
The American Heart Association grew out of a set of smaller precursor groups. The primary precursor was the Association for the Prevention and Relief of Heart Disease, formed in New York City in 1915, to study whether patients with heart disease could safely return to work. Several similar organizations formed or evolved in Boston, Philadelphia, and Chicago in the 1920s. Recognizing the need for a national organization to share research and promote findings, the American Heart Association was formed in 1924 by six cardiologists representing several of these precursor groups.
American Historical Association
The American Historical Association (AHA) is the oldest and largest society of historians and professors of history in the United States. Founded in 1884, the association promotes historical studies, the teaching of history, and the preservation of and access to historical materials. It publishes "The American Historical Review" five times a year, with scholarly articles and book reviews. The AHA is the major organization for historians working in the United States, while the Organization of American Historians is the major organization for historians who study and teach about the United States.