Certain years are so eventful they are regarded as pivotal in history, years when wars and slavery ended and deep generational fissures burst into the open — , and among them. The year will certainly join this list. It will long be remembered and studied as a time when more than 1. The photographs in this collection capture those historic 12 months. The impeachment of an American president culminated in early But two pictures taken in late January in Wuhan, China, are hints of a larger cataclysm to come.