Philadelphia is home to the second U.S. library .
Philadelphia is the birthplace of the `` United States Marine Corps '' and is also the home of many U.S. establishments including the first hospital ( 1751 ) , medical school , ( 1765 ) , first Capital , ( 1777 ) , first stock exchange ( 1790 ) , first zoo ( 1874 ) , and the first business school ( 1881 ) , while it has the U.S. ' second library ( 1731 ) .
Philadelphia