As you'll know World War 2 (in Europe) began with Britain and France declaring war on Germany after it invaded Poland. But when the USSR invaded soon afterwards, the allies did nothing. But why? Why was there no declaration of war on the Soviet Union? Find out in this short and simple animated history documentary.

Twitter:   / tenminhistory  
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A special thanks to all of these Patrons below, without whom the show wouldn't be possible:

Franco La Bruna
Kevin Sanders
Chris Fatta
Richard Wolfe
Gregory The Bittersteel
Stefan Møller
anon
sharpie660
Ian Jensen
SirAlpaka
D. Mahlik
Qi Xiao
Dragan
Andrew Miraut
Dexter_McAaron
Wolf
Andrew Niedbala
Rod D. Martin
John Garcia
Ariadni Voulgari
Paul McGee
Nathan Perlman
Bernardo Santos
Danny Anstess
Henry Rabung
Tristan Kreller
Jane Sumpter
Chris Hall
Christopher Godfrey
Christopher S Nelson
Perry Gagne
Shaun Pullin
Warren Rudkin
James Bisonette Fan #1
Magdalena ReinbergLeibel
bas mensink
Joooooshhhhhh
jdk
Troy Schmidt
Alen
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I'm Not In The Description
Cap
William Wold
Jeffrey Schneider
FF Nelly
Mark Ploegstra
Liam Gilleece
Kinfe85
Luke Robinson
Haydn Noble
MrPalomino
Josh Cornelius
Colm Boyle
TooMuchWaterYouDie
HelloAgainThere
Julian Baumann
Richard Manklow
Nick Finan
Colin Steele
Gabriel Lunde
João Santos
Christine Purvis
Konstantin Bredyuk
Big Nick
Donald Weaver
Steve Bonds
Seth Reeves
Pierre Le Mouel

Sources:
British Reactions to the Soviet Occupation of Eastern Poland in September 1939 by Keith Sword

POLAND IN BRITISH AND FRENCH POLICY IN 1939: DETERMINATION TO FIGHT—OR AVOID WAR? by ANNA M. CIENCIALA

Choosing Not to Choose in 1939: Poland's Assessment of the NaziSoviet Pact by MAREK KORNAT