Anthony Hope's 1894 romance was titled "The ___ of Zenda"?

An 1888 treaty declared which canal neutral and open to ships even in wartime? An 1890 act of Congress said that the designs of which items could be changed no more than once every 25 years? Which 1890 Ibsen play opens as its title character returns from a honeymoon, disappointed by her marriage? William Painter's 1890s "crown" bottle cap was originally lined with what material? Which title of an 1895 novel by Henryk Sienkiewicz is Latin for "Where are you going?" An 1895 textbook called which shapeless one-celled creature the lowest form of animal life? The 1897 "Officer's Knife," with a corkscrew and a second blade, became known by what name? An 1898 Amsterdam exhibition devoted to which Old Master has been called the first blockbuster art show?