Answer:
umm science I think....................
It was just another way to show off how much money they had, same with many other civilizations
James buchanan, Jr. April 23, 1791- June, 1868 was the 15th president of the united states ( 1857-61) serving immediately prior to the American Civil war. he represented Pennsylvania in the United States house of Representatives and later the Senate, then serve as minister to Russia under president Andrew jackson