Articles

ERA 10: Contemporary United States (1968 to the present)
ERA 9: Postwar United States (1945 to early 1970's)
ERA 10: Contemporary United States (1968 to the present)
ERA 7: The Emergence of Modern America (1890–1930)

Historical Documents

Patsy Murr, first grader at Fulton School in Lancaster, Pa., gets her Salk shot from Dr. Norman E. Snyder as she is held by Mrs. Walter Sourweine, April 25, 1955. Others view the proceedings with mixed emotions
ERA 9: Postwar United States (1945 to early 1970's)
ERA 10: Contemporary United States (1968 to the present)
ERA 5: Civil War and Reconstruction (1850-1877)
ERA 3: Revolution and the New Nation (1754–1820s)