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On January 24, 1906, Representative William P. Hepburn of Iowa introduced his bill to expand the powers of the Interstate Commerce Commission (ICC). It passed the House without changes, but the Senate-approved version included many amendments. Finding that the amendments didn’t alter the bill’s fundamental provisions, the House approved the Senate version. The Hepburn Act became effective on June 29, 1906.
Records of the U.S. House of Representatives, National Archives and Records Administration