On June 8, 1982, Ronald Reagan delivered a historic address to the British Parliament, promising that the United States would give people around the world “a voice in their own destiny” in the struggle against Soviet totalitarianism. While British Prime Minister Margaret Thatcher celebrated Reagan’s visit and thanked him for putting “freedom on the offensive,” over 100,000 Britons marched from Hyde Park to Trafalgar Square to protest his arrival and call for nuclear disarmament. Reagan’s homecoming was equally eventful, with 1,000,000 protesters marking his return with a rally for...