Cal Poly Pomona Alumna Hilda Solis was appointed as the Secretary of Labor on February 24, 2009. Prior to her appointment by the Obama Administration, Secretary Solis represented the 32nd Congressional District in California, a position she held from 2001–2009. She previously served in California's State Senate (1994–2001) and Assembly (1992–1994). Hilda Solis made history as the first Latina elected to serve in the California State Senate and the U.S. Cabinet.

The Hilda Solis Congressional Collection contains material donated from Solis's El Monte District office. The Collection contains an assortment of materials that document and give insight into Solis's years as a United States Congresswoman. The Collection features hours of video footage of Solis speaking before Congress, legislative files, artifacts, newspaper clippings, and other materials that illustrate Congresswoman Solis's concerns and causes, and her enduring connection to her community.