Churchill claimed that the Soviet Union wanted greater control over Europe (Which was also true in a way) but what he forgot to mention was that the United Kingdom also wanted greater control, although for them this was something that could have been achieved more indirectly as opposed to direct control.
Churchill claimed that the Soviet Union did not want a war, but to get the fruits of war and indefinite amount of expansion. It is important to note that after World War II, no country was foolish to go for another war. Basically Churchill also wanted balance of power, as has been mentioned in his speech.
The Battle for Guadalcanal is important because Allied forces finally began to take the offensive for the first time in the Pacific. This battle was held from August 7th, 1942 to February 9th, 1943.