In the context of World War II, the 'Big Three' consisted of the leaders of the three most powerful countries on the side of the Allies. They were Winston Churchill, the Prime Minister of Great Britain, Franklin D. Roosevelt, the President of the United States, and Joseph Stalin, the Premier of the Soviet Union.
https://study.com/academy/answer/who-were-the-big-3-in-world-war-ii.html
The California Gold Rush brought some 300,000 people to California from the rest of the United States. Hope this helps!
The leaders which were key to the independence movement in South America were b) Simon Bolivar and d) Jose de San Martin. Jose de San Martin "was an Argentine general and the prime leader of the southern part of South America's successful struggle for independence from the Spanish Empire." Simon Bolivar was "a Venezuelan military and political leader who played an instrumental role in the establishment of Venezuela, Ecuador, Bolivia, Peru, and Colombia as sovereign states, independent of Spanish rule."
C. Chinese communist leaders worked directly to serve rural peasants. Soviet leaders viewed themselves as guides for urban workers.
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-procklown
