Hmm, my vote(s) go to:
-President Franklin D. Roosevelt for his approach to the Great Depression. World War II could be considered an achievement too, but since he didn't survive to see the end of it, it's resolutions and such, credit really can't be given to FDR.
-President Dwight D. Eisenhower for one and only one reason: The Interstate System! That's right. If you look on the side of the road when driving on an interstate, you will notice a little blue sign with 5 stars on it saying "The Eisenhower Interstate System" While he realized that America needed ways to travel distances in our new favourite way to travel-car-he also realized that such a massive program would take years for it to get through legislation. Instead, he filed it as a defence initiative, stating that if an attack on the US mainland, like that at Pearl Harbor during WWII, were to occur, it could take up to a week for defence forces in the east to travel west, and vice versa. Today, we enjoy an easy way to travel around the US, even if travel today by other methods is much faster.
-President John F. Kennedy. Not only a fellow 'Bay stater', but also the man who in 1961 got the US space program underway, and whose vision that the US would put a man on the moon by the end of the decade came true. While rumours abound about his personal life, for a short time he and Jackie were America's royalty. Even today we still regard the couple that occupied the White House from 1961 to 1963 as people who restored grace and beauty to a turbulent post-war era.
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