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From these two papal promulgations of 1950, many observers were ready to conclude that in the second half of the 20th century Roman Catholicism would assume an essentially defensive posture in relation to the modern world. Those who had come to that conclusion were compelled to revise it by the pontificate of John XXIII (reigned 1958–63) and by the Second Vatican Council, commonly referred to as Vatican II. During his brief reign, Pope John issued several important encyclicals. Of special interest is Mater et magistra (“Mother and Teacher”), published on May 15, 1961, which explicitly aligned itself with Rerum novarum ...(100 of 56687 words)