I'm participating in the National History Day competition with some friends and we're making a documentary about Winston Churchill. We're attempting to show the more negative side to his legacy.
We read in the book "Killing Patton" that he and Stalin had a plan to divide up post-war Europe after World War II so that England had 90% of the west and 10% of the east, while Russia had 90% of the east and 10% of the west.
What would this look like on a map of Europe and how accurate are these figures?
"Killing Patton" is hardly an academic source. For what it's worth, Churchill encouraged the continent to develop into a federated European Union, a literal United States of Europe, though sans the UK. This was at the Conference at The Hague in 1948.
Churchill is regarded as one of the greatest Britons to have ever lived for his work in saving the country from defeat during the Second World War. That being said, the man was not without controversies. So, while I can't answer your specific question, the following article may be of use for your documentary.
The 10 greatest controversies of Winston Churchill's career
While acknowledging and paying due respect to the fact that he was a leading reason for Britain's resilience and effective Wartime strategy, it is also important to acknowledge that he promoted some viewpoints and took some actions that today could be considered unjust, racist, discriminatory or paternalistic.