American Stories: Paintings of Everyday Life, 1765–1915

George Bellows, Cliff Dwellers, 1913
"Between the American Revolution and World War I, a group of British colonies became states, the frontier pushed westward to span the continent, a rural and agricultural society became urban and industrial, and the United States—reunified after the Civil War under an increasingly powerful federal government—emerged as a leading participant in world affairs."
The Metropolitan Museum of Art, Resource Library