Who was the 5th president and what did he do to better our country?

He is best known for establishing the foreign policy principle that came to bear his name, the Monroe Doctrine. He is also the person for whom Monrovia, the capital city of Liberia, was named.

the two atomic bombs dropped on japan in 1945 killed and maimed hundreds of thousands of people, and their effects are still being felt today. the uranium bomb detonated over hiroshima on 6 august 1945 had an explosive yield equal to 15,000 tonnes of tnt.