Twitter: https://twitter.com/Tenminhistory Patreon: https://www.patreon.com/user?u=4973164 Merch: https://teespring.com/stores/history-matters-store-2 Special Thanks to the following Patrons for their support on Patreon: Richard Wolfe Kevin Sanders Chris Fatta Daniel Lambert Tom Loghrin Joshua anon Matthew John Garcia Andrew Niedbala Mitchell Wildoer William Foster Blaine Tillack Norman A. Letterman Danny Anstess Bernardo Santos Will Davis-Coleman Richard Hartzell Cornel Borină LavaLampLover3000 Henry Rabung Shaun Pullin Perry Gagne Joooooshhhhhh FuzzytheFair Jeffrey Schneider Armani_banani Paul Spencer Smith Byzans_Scotorius Haydn Noble Gideon Rashkes Roberto Chance Cansler Andrew Keeling Richard Manklow João Santos Gabriel Lunde Sources: A Concise History of German (Third Edition) by Mary Fullbrook Mapping the Polish Corridor: Ethnicity, Economics and Geopolitics by Joshua Hagen.