An 1890 act of Congress said that the designs of which items could be changed no more than once every 25 years?

An 1886 labor rally in which city's Haymarket Square turned into a riot after a bomb was thrown? In 1887, a one-year baseball rule counted which free passes as hits, inflating batting averages? An 1888 collection of Chekhov's stories won him a prize named for which fellow Russian writer? An 1888 treaty declared which canal neutral and open to ships even in wartime? 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? Anthony Hope's 1894 romance was titled "The ___ of Zenda"? Which title of an 1895 novel by Henryk Sienkiewicz is Latin for "Where are you going?"