Throughout his presidency, Ronald Reagan sought "peace through strength" during an era of historic change. In the decades since, pundits and scholars have argued over the president's legacy: some consider Reagan a charismatic and consummate leader who renewed American strength and defeated communism. To others he was an ambitious and dangerous warmonger whose presidency was plagued with mismanagement, misconduct, and foreign policy failures. The recent declassification of Reagan administration records and the availability of new Soviet documents has created an opportunity for more nuanced,...