Proponents of increased gun laws in the United States argue that limiting access to guns will save lives and reduce crime; opponents insist that it would actually do the opposite by preventing law-abiding citizens from defending themselves against armed criminals. Research has shown that states with tighter policies save lives: One study by Stephanie Chao found that states with stricter gun laws have lower rates of gun deaths among children and teenagers, and states with child prevention access laws are linked with fewer gun s ucides in this age group.Gun ownership in the United States is rooted in the Second Amendment of the Constitution: