At his death in March 1848, who left a fortune of about $20 million made in the fur trade and real estate?

Which renowned concert pianist served as Poland's prime minister in 1919? At his death in 1971, more than 1,600 department stores bore which merchant's name? At his death in 1995, which polio vaccine developer was working on a vaccine to prevent full-blown AIDS? At his death in April 1955, whose brain was preserved and whose ashes were reportedly scattered in the Delaware River? At his death on October 20, 1964, which president had lived longer after leaving office than any other up to that time,… At his death in 1975, which Oregon runner, later the subject of two biopics, held every U.S. record from 2,000 to 10,00… At his first inauguration on March 4, 1861, which president said the "momentous issue of civil war" was not in his hand… At whose funeral on June 6, 1989, did frenzied crowds break open the coffin, causing the body to fall to the ground?