Pennsylvania,and Philadelphia in particular, were very involved in America's War with Mexico, 1846–1848. It rarely get mentioned in current times. Here's the impact it had then summarized in one minute:
Bartleson, William V., "Mexican-American War, " The Encyclopedia of Greater Philadelphia (https://philadelphiaencyclopedia.org/essays/mexican-american-war/ : accessed 23 Jan 2023), posted 2017.
Drexler, Ken, "Mexican War: A Resource Guide," Library of Congress (https://guides.loc.gov/mexican-war : accessed 23 Jan 2023), updated 22 Jun 2022.
Photos used in this video were sourced from the Library of Congress Digital Collections.