The answer is Roosevelt. He was the one who supported the Manhattan project and construction of the nuclear bomb, but Truman was the one who made the decision to drop it.
There aren't just two, there are actually nine. Mexico can be divided into nine major physio-graphic regions: Baja California, the Pacific Coastal Lowlands, the Mexican Plateau, the Sierra Madre Oriental, the Sierra Madre Occidental, the Cordillera Neo-Volcánica, the Gulf Coastal Plain, the Southern Highlands, and the Yucatán Peninsula.
It conveys the feeling of warmth, the feeling that America is a beautiful and fruitful country.