sentences:  The NMAI’s American Imagist Collection focuses on artwork from the 'Golden Age of American Illustration', a period whose heyday dates from 1865 to 1945, with the end of the original "Saturday Evening Post" marking its ultimate demise.The NMAI features original art created by illustrators such as Norman Rockwell, Maxfield Parrish, N.C. Wyeth, Howard Pyle, J. C. Leyendecker, and Jessie Willcox Smith.The illustrators created images integral to American culture, ranging from the New Year’s Baby to Uncle Sam.