Iran, the United States and other world powers struck a historic deal Tuesday to curb Iranian nuclear programs and ease fears of a nuclear-armed Iran threatening the volatile Middle East. In exchange, Iran will get billions of dollars in relief from crushing international sanctions. The accord, reached after long, fractious negotiations, marks a dramatic break from decades of animosity between the United States and Iran, countries that have labeled each other the "leading state sponsor of terrorism" and "the Great Satan." "This deal offers an opportunity to move in a new direction," President Barack Obama declared at the White House...