Answer:
shows criminal activity in the U.S. had increased greatly.
Step-by-step explanation:
There is no "crime wave" in real life, however, a wave suggest a sudden accumulation of water that in turn crashes onto a land form. This would be the case of a "crime wave". There may be a steady and low amount of crime before and after, but during the 1930s, the amount of crime in the US rose sharply.
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