Civilizational contact shifted from multidirectional exchange to one-way Western dominance.

Evidence

Intermittent or limited multidirectional encounters among civilizations gave way to the sustained, overpowering, unidirectional impact of the West on all other civilizations. … For four hundred years intercivilizational relations consisted of the subordination of other societies to Western civilization. — Samuel P. Huntington, The Clash of Civilizations and the…, 139