In 1887, a one-year baseball rule counted which free passes as hits, inflating batting averages?

An 1881 autopsy showed which assassinated president died largely from infection caused by his doctors, not the bullet? An 1882 act barred laborers from which Asian country from entering the United States? The 1886 copyright convention and the 1864 convention on the rules of war were both signed in which country? An 1886 labor rally in which city's Haymarket Square turned into a riot after a bomb was thrown? 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? 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?