CHICAGO.- For the first time, the bulk of the Art Institute's world-renowned collection of American art can now be seen together. This assemblage--drawn from a collection of some 3,500 works dating from the colonial period to 1950--is enriched by a historic long-term loan agreement with the Terra Foundation for the Arts, which has contributed 50 of their greatest paintings and a stellar selection of works on paper, making the Art Institute one of the major centers for American art in the world. In addition to the work of such beloved artists as George Bellows, Mary Cassatt, Winslow Homer, and John Singer Sargent, visitors will be able to enjoy an in-depth presentation of Modernist giants like Charles Demuth, Marsden Hartley, Edward Hopper, Georgia O'Keeffe, Charles Sheeler, and Grant Wood, all in one splendid, enlightening presentation.