when did american schools become gun free zones
Gun-Free School Zones Act of 1990 It was first introduced in the U.S. Senate in February 1990 as S. 2070[1] by Senator Herb Kohl of Wisconsin and then was incorporated into the Crime Control Act of 1990 that was signed into law by President George H. W. Bush.
One-child policy Effective from January 2016, the one-child policy was replaced by a two-child policy, allowing each couple to have two children.
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Vietnam War North Vietnamese victory