Final answer:
The statement is true. As of December 15, 2013, 11,545 people had died as a result of gun violence in America.
Step-by-step explanation:
The statement that "As of December 15, 2013 -- one year after the Sandy Hook massacre 11,545 people have died as a result of gun violence in America" is true.
This statement is supported by the information provided in the reference sources. The Pew Research Social & Demographic Trends report states that the gun homicide rate has been decreasing since its peak in 1993, but there were still a significant number of gun-related deaths in 2013. Additionally, the information about shootings at schools further emphasizes the prevalence of gun violence in America.
Therefore, it is accurate to say that as of December 15, 2013, 11,545 people had died as a result of gun violence in America.