John Andrew Jackson Creswell (November 18, 1828 – December 23, 1891) was an American politician and abolitionist from Maryland, who served as United States Representative, United States Senator, and as Postmaster General of the United States appointed by President Ulysses S. Grant. Creswell is considered to be one of the ablest, if not the best, Postmaster General in United States history. Creswell modernized the U.S. Postal system to adapt to an expanding demand for increased postal routes throughout the Western states and remain competitive worldwide. Creswell also integrated the U.S. Postal system appointing both male and female African American postmasters throughout the United States, giving them significant positions of federal authority. Sweeping and constructive reforms of the U.S.