Because of the increasing gun violence brought on by the so-called mob wars in Chicago and New York, Congress enacted the Firearms Act of 1934, which sought to regulate the fully-automatic firearms that seemed to be favored by warring crime families.
No one had anything to say about the Second Amendment being weakened.
Four years later, Congress took it a step further by passing the Gun Control Act of 1938, which not only placed placed the first limitations on the sale of firearms, but also required persons selling guns to purchase a permit and to maintain a file with names and addresses of persons who purchased said firearms. It also made it illegal for those who were convicted of violent felonies from owning firearms of any kind.
Again, no one had anything to say about the Second Amendment being weakened.
It's a shame that the National Rifle Association, an organization with only 4 million members, can have such influence AND control over Congress . . . and the rest of us.