Word: levels
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Dates: during 1950-1959
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...fundamental condition to be an ally of the U.S. was to be democratic; now it is to be anti-Russian. The old democratic friends of the U.S. are now criticized as pro-Russian." Right or wrong, these and other Latin American views would once more be assured top-level U.S. consideration...
...first breakthrough came with the domestication (almost simultaneous) of plants and animals. Agricultural man, who appeared in the Middle East about 7,000 years ago, filled whole fields with food plants and thus turned more solar energy into a form he could use. This method (level two) was much more effective than level one. About 1,000 years after its start, high civilizations were flourishing, with big cities, proud kings, complex religions and devastating wars. Many such cultures rose and fell with rhythmic repetition. But except for such cycles, there was little change for nearly 6,000 years...