Who Started World War II?

[Oberon]

Originally Posted by Joefour

So why didn't Britain declare war ALSO on the Soviet Union for invading Poland from the east? Instead, she allied herself with the russians. Makes no logical sense to me whatsoever, that is, unless something else was going on that we don't know about. Perhaps this should be explored too.

Hitler launched his invasion first, there was debate on the possibility of declaring war on Russia, around about the time that Russia and Finland went to war I believe, but it was decided that to fight both Russia and Germany would be suicidal.
Then when Hitler declared war on Russia it was simply a case of 'My enemies enemy is my friend', Britain had no real love for the Soviet Union, heck we drew up plans to declare war on them after WWII had finished but they were thrown out as being suicidal, but Russia had the resources to defeat Germany, Britain did not, and so by supporting Russia and keeping Russia in the war, it both tied up the bulk of German forces on the other side of Europe from Britain, thus stopping Hitler from thinking about reinventing Sealion, and it gave a better chance of Germany being defeated, or at the very least keeping the war going long enough for the UK to persuade the USA to get fully involved.