President Barack Obama is launching the most sweeping effort to curb American gun violence in nearly two decades, and New York lawmakers easily passed the toughest gun control law in the country, as gun control advocates move to act swiftly after a massacre at an elementary school last month.

Obama is urging a reluctant Congress to ban military-style assault weapons and high-capacity ammunition magazines like those used in the Dec. 14 massacre of 20 elementary school children in Newtown, Connecticut.
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