What was the middle name of American catalog merchant Aaron ___ Ward?

On April 19, 1933, the United States effectively went off which monetary system? American architect Daniel Burnham was director of works for the 1893 World's Fair in which city? American astronomer Asaph Hall discovered which planet's two moons in 1877? "American Caesar" is a biography of which general, who told Congress "Old soldiers never die"? Composer Robert Ward based a 1961 opera on which author's famous play "The Crucible"? American doughboys in World War I called which ruler "Kaiser Bill"? American flags flew at half-mast when which Frenchman died in Paris on May 20, 1834? American forces crossed which river on Christmas night 1776 to surprise the Hessians?