Photo President Obama at the White House on Thursday, discussing the Iran nuclear accord. Democrats cleared the way for the deal to go into effect after a key procedural vote in the Senate. Credit Stephen Crowley/The New York Times WASHINGTON — With Senate Democrats blocking passage of a resolution disapproving of the Iran nuclear deal, the attention will shift from the halls of Congress to the nations and international agencies that must put the accord into effect. Here’s what happens next. Q. What is the first thing that will happen? A. The agreement is to be formally adopted on Oct. 19 — 90 days after it was endorsed by the United Nations Security Council . That is the day Iran and the six world powers that concluded the accord — the United States, Germany, Britain, France, Russia and China — are to start taking steps to comply, although most […]