SAN FRANCISCO — Americans have a constitutional right to own guns, the Supreme Court declared Thursday in a ruling that resoundingly endorsed the ability of an armed populace to resist tyranny but appeared to allow bans on military-style weapons and regulations on other firearms. The National Rifle Association immediately said it would use the ruling for a new round of legal challenges to gun-control laws, including a ban on handgun possession in public housing in... (GunPolicy.org)