33,000 die from gun violence and 79,000 people are wounded every year on average from 2010 - 2014.
From 2007-2011, there were 29,618,300 acts of violent crime. 0.8% of the time, the victims threatened or attacked the criminals with a firearm. http://www.vpc.org/studies
Background checks are not required under federal law for intrastate firearm transfers between private parties. https://en.wikipedia.org/wiki/National_Instant_Criminal_Background_Check_System
Trump doesn't believe in expanding the national background check system, while Clinton does.
In the 14 US states that had background checks for some or all private handgun sales, the firearm homicide rate of women by intimate partners was 46 percent lower than the rest of the country.