Why might the Allies have allowed the Soviet Union to join them when they knew full well about Stalin's tactics

The correct answer to this open question is the following.

Although there are no options attached, we can say the following.

Allies allowed the Soviet Union to join them when they knew full well about Stalin's tactics because Great Britain and France really knew that they alone, could not stop Hitler's troops from invading France and then the British territory.

Winston Churchill and Charles De Gaulle knew that although Joseph Stalin was a tyrant and a dictator, he ruled over a great land with supplies and had the kind of strong men in its army that could be of great help to contain the Germans.

That is how, the three allies with the help of the United States army, could devise a plan to retake North Africa to invade through Italy (the Axis troops had occupied North Africa), invade France from Britain and Germany from the Soviet Union. Once done that, the United States Navy with the help of the Allies could attack and defeat Japan in the Pacific.

booker t. washington was an educator who established the tuskegee institute. washington argued that african americans should learn trades that would offer them the opportunity to be progressive citizens. instead of fighting against discrimination, washington argued that african americans should use their education and knowledge to become self-sufficient in american society and not in competition with white americans.

w.e.b du bois was the founder of the niagara movement and later the naacp, du bois disagreed with washington. he argued that african americans should consistently fight for racial equality.

ida b. wells was a journalist who wrote about the horrors of lynching in the south. wells work could be considered muckraking as it led to the development of the anti-lynching campaign.

a widespread disease that killed many people

the split of the christian church

invasion from arab muslims