Winston Churchill was Prime Minister of Great Britain - one of the allies. The baddies were the axis powers.
Axis
Adolf Hitler was in the axis power because he fought against the united states and was not an ally to us.
Rome and China
If you are referring to WWI, then it is the Central Powers. If you are referring to WWII, then it is the Axis Powers.
Ally
He was the president of the United States, which was the strongest ally. So, he was an Ally.
Germany
Axis Power.
Australia fought in WW2 as an ally of Great Britain in both the European and pacific parts of WW2. Australia made its forces and its infrastructure available in the war against the Germans and the Japanese.
Stalin , along with Roosevelt and Churchill , was a member of the Allies .
Italy was part of the Axis (ally to Hitler)
Winston Churchill was the Prime Minster of England during WWII. England was part of the Ally forces not the Axis powers.