Conclusion: (click here) Mass-shooting related homicides in the United States were reduced during the years of the federal assault weapons ban of 1994 to 2004.
Any loopholes that allowed weapons to be obtained can be addressed. The article above is what Bill Clinton read when he made the following statement.
“How many more people have to die before we reinstate the assault weapons ban & the limit on high-capacity magazines & pass universal background checks? After they passed in 1994, there was a big drop in mass shooting deaths. When the ban expired, they rose again. We must act now.”— Former president Bill Clinton, in a tweet, Aug. 5, 2019
In the Washington Post article there was a data chart. It doesn't matter which method was used to make it, the data across the chart was all treated the same way, so there is some degree of truth in this graph. The black line shows the trend of the mass killings. I want to emphasize the increase in these killings since 2014.
It was June 17, 2015 when Donald John Trump announced his race for the presidency. The numbers of mass shooting deaths increased that year and continued to increase the trend ever since.