3. What did they stop making to make machine guns?

In April 1986, after months of efforts, the NRA had finally rallied enough support in the Democratic-controlled House to force a bill onto the floor. The so-called Firearms Owners' Protection Act would undo many of the provisions in the 1968 Gun Control Act, passed shortly after Robert Kennedy and Martin Luther King were shot dead.

But just as the bill was about to come to a final vote in that tumultuous House session, New Jersey Democrat William Hughes introduced an amendment. It would forbid the sale to civilians of all machine guns made after the law took effect.

Explanation:

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immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers