During the 1950s, the twin pillars of worldwide anti-communism were Dwight Eisenhower’s America and the Roman Catholic Church of Pope Pius XII. During the 1980s, the last decade of the Cold War, Ronald Reagan and the Polish pope, John Paul II, were the pillars of resistance. When Pope Francis arrives in Washington on Tuesday afternoon, the country he enters will be a very different one from Eisenhower’s America or Reagan’s America.