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WI Britain declared war on USSR in 1939

I have just read the Wikipedia article on Anglo-Polish Alliance, and noticed this:

Both the initial unilateral British guarantee, and the bilateral Pact, required the attacked party to decide to engage the aggressor "in hostilities", "with its national armed forces". Since Poland did not do that, Great Britain came under no obligation to declare war on the Soviet Union.

What if, the Polish did engaged the invading Soviet army, and Britain honoured the Alliance by declaring war on the USSR? Will the French follow suit? (It seems the French did'nt have similar obligations. See Wikipedia article on Franco-Polish_Military_Alliance)

Germany and USSR will be pushed into the same side against Britain and France, and co-dominate Eastern Europe. But how long can Hitler and Stalin tolerate the other despite their great ideological divergence?

I speculate some hostilities would have broken out in Central Asia. UK might send troops to assist Finland in the Winter War (Will the Soviets still invade Finland in Nov 1939?) through Petsamo or Narvik. and we would end up with more Allied forces in Scandinavia. Will this affect the outcome of Norwegian Campaign, e.g. the Allies might hold on in Northern Norway?

And would the Japanese enter the war on the German side? Or, moved by its anti-Communist sentiment, would eventually join the Allies and attack the Soviets?

Will the US enter the war? If yes, when?

Please discuss.
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