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Well, again, their improvement is roughly the same improvement that has been seen nation wide with the national average during the same time frame.
Here is another chart from the Department of Justice showing the trend of the National homicide rate:
The current homicide rate is only slightly worse than what the country had back in 1950, when gun laws were extremely lax nation-wide.
If all of the very many gun laws past since 1950 have had any effect on homicide, it has been quite minimal.
If you look at this chart, you would think that the United States went crazy back in the late 1960's, and did not begin to become sane again until the mid 1990's
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