In 1897, Theodor Herzl convened the first of which congresses in Basel, Switzerland?

Which city hosted the first modern Olympic Games in 1896? The 1896 Supreme Court case Plessy v. Ferguson upheld racial segregation under the doctrine of "separate but" what? Who was first lady from 1897 to 1901? In 1897, which future revolutionary was exiled to Siberia, 20 years before leading the October Revolution? Which 1897 novel includes the line "There are such beings as vampires; some of us have evidence that they exist"? The 1898 Battle of San Juan Hill was fought during which war? The 1898 Treaty of Paris ceded control of the Philippines to which nation? Which actor (1899–1957) delivered the "Casablanca" line "Here's looking at you, kid"?