Open this photo in gallery: Demonstrators hold a rally to call on Harvard leadership to resist interference at the university by the federal government, in Cambridge, Mass., on April 12.Nicholas Pfosi/Reuters The world’s richest university. The world’s most powerful figure. A struggle for advantage between two titanic forces, each with contempt for the other, both with their historic legacies on the line. This collision between Harvard University and Donald Trump – and this week’s freezing of US$2.2-billion in federal funds after the university defied the President – is the latest confrontation in a season of contention in the United States....