Over the past year, our nation’s diplomats, along with global powers, have been working tirelessly to produce an agreement that will prevent both an Iranian nuclear weapon and another war in the Middle East. Keeping Iran from acquiring a nuclear weapon is of central importance to American security - and achieving this through tough diplomacy is difficult, but very possible.To be sure, Monday’s announcement that negotiations would continue was not the conclusive end we hoped for; all sides want to see the critical question of Iran’s nuclear program resolved. But the simple fact remains that the world is better off now than it was a year ago.