Are there any more great men?

I was born in 1933. Not long before I was born, Franklin Delano Roosevelt was sworn in as President of the United States. I didn't have a lot of awareness of FDR before World War 2, but after Pearl Harbor (which I well remember) the name Roosevelt was constantly in the news. And, because we entered the war in Europe, the name Winston Churchill became very well known. Two great men leading their allied nations in the war against Hitler and Tojo. How important were they in our victory? I believe they were very important.