![This 1829 cartoon mocked the Philadelphia militia.](/sites/default/files/styles/large/public/The%20Nation%27s%20Bulwark.jpg?itok=rHLLEMcB)
"The Nation's Bulwark. A well disciplined militia"
![Sentries on duty in front of the Canada National War Memorial.](/sites/default/files/styles/large/public/Nathan%20Cirillo.jpg?itok=eec2m4Rl)
Canada National War Memorial
Minute Man Statue, Concord
![Illustration by Thomas Nast.](/sites/default/files/styles/large/public/Worse%20than%20Slavery.jpg?itok=NbLlGCNy)
Thomas Nast "The Union as it was/ The Lost Cause, worse than slavery"
![Michael Zehaf-Bibeau.](/sites/default/files/styles/large/public/Zehaf%20Bibeau.jpg?itok=Y0QgGc_T)
Zehaf-Bibeau
![Canada's Winnipeg General Strike.](/sites/default/files/styles/large/public/Winnipeg%20General%20Strike.jpg?itok=a3aSEC8r)
Winnipeg General Strike, 1919
![Plaque at École Polytechnique.](/sites/default/files/styles/large/public/Montreal%20Memorial.jpg?itok=3OkU8Cnr)
École Polytechnique Massacre
Hope Columbine Memorial Library
![Scene in Fairmount Park, Philadelphia.](/sites/default/files/styles/large/public/Negro%20Militia.jpg?itok=oBBLjB3u)
"Negro Militia After a Drill," 1876
![Canada's National Firearm Association.](/sites/default/files/styles/large/public/Canada%27s%20National%20Firearm.png?itok=dWnj7pfK)
Canada's National Firearm Association
![Smith and Wesson Model 60 .38 Special revolver.](/sites/default/files/styles/large/public/Smith%20and%20W.jpg?itok=OnAkR1iE)
Smith & Wesson Revolver
![Displays at a gun show in Houston, Texas.](/sites/default/files/styles/large/public/Gun%20Show.jpg?itok=wELStiYv)
Gun Shows in the United States
![An example of Canada's possession-acquisition or possession-only (PAL/POL) license.](/sites/default/files/styles/large/public/POL_Canada.gif?itok=KIz-GoSR)
Possession-Only License
![Police arrive at Sandy Hook Elementary after the shooting.](/sites/default/files/styles/large/public/Police_at_Sandy_Hook.png?itok=oaPlxJij)
Sandy Hook Elementary