Assertion: child poverty | /r/HasProperty | shown by the fact
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Source sentences:
text: Then, after a brief period of stability in the early 1970s, child poverty drifted generally upwards until the early 1990s, as shown by the fact that as compared with an average of about 15 percent in the early 1970s, child poverty seldom fell below 20 percent in the years after 1980.