Why didn t the Allies declare war on the USSR when they invaded Poland?

Watch awesome documentaries on CuriosityStream with this link: http://go.thoughtleaders.io/1650220200209 Register with the promo code "knowledgia" to get a 30-day free trial! ♦Consider to Support the Channel of Patreon and gain cool stuff: https://www.patreon.com/Knowledgia ♦Please consider to SUBSCRIBE : https://goo.gl/YJNqek ♦Music Used : Kevin MacLeod - Black Vortex Kevin MacLeod - Theme Kevin MacLeod - The Complex ♦Sources : The Popular Front and Central Europe: The Dilemmas of French Impotence 1918-1940 By Nicole Jordan Prazmowska, Anita J. (2004). Britain, Poland and the Eastern Front, 1939. Cambridge Russian, Soviet and Post-Soviet Studies Soviet and East European Studies. Volume 53. Cambridge University Press. p. 203. ISBN 9780521529389. Keith Sword. British Reactions to the Soviet Occupation of Eastern Poland in September 1939. The Slavonic and East European Review, Vol. 69, No. 1 (Jan., 1991), pp. 81-101. Prazmowska, Anita J. (2004). Britain, Poland and the Eastern Front, 1939. Cambridge Russian, Soviet and Post-Soviet Studies Soviet and East European Studies. Volume 53. Cambridge University Press. p. 203. ISBN 9780521529389. https://www.historyextra.com/period/second-world-war/why-did-britain-and-france-not-declare-war-on-the-soviet-union-when-the-red-army-marched-on-poland-in-september-1939/ https://en.wikipedia.org/wiki/Edward_Wood,_1st_Earl_of_Halifax#/media/File:1st_Earl_of_Halifax_1947.jpg #History #Documentary