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Robert Kagan, a veteran of the Reagan administration and scholar of foreign policy, explores America’s global role in his new book, “The Ghost at the Feast: America and the Collapse of World Order, 1900-1941.” On Tuesday, Feb. 7 at 11:00 a.m. ET, Kagan joins The Post’s Frances Stead Sellars to discuss the historical parallels between the 20th century and today in how America views its role and responsibilities in the world.