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Big, unexpected changes are here to stay.Slow, incremental change has become a relic of the past. Today's shifts come fast and big, what Darrell West calls megachanges, in which dramatic disruptions in trends and policies occur on a regular basis.Domestically, we see megachange at work in the new attitudes and policies toward same-sex marriage, health care, smoking, and the widespread legalization of marijuana use. Globally, we have seen the extraordinary rise and then collapse of the Arab Spring, the emergence of religious zealotry, the growing influence of nonstate actors, the spread of ISIS-fomented terrorism, the rise of new economic and political powers in Asia, and the fracturing of once-stable international alliances.Long-held assumptions have been shattered, and the proliferation of unexpected events is confounding experts in the United States and around the globe.