WASHINGTON (Reuters) - Automatic government spending cuts set to take effect next month would undermine U.S. diplomacy and security policies at a time of turmoil across the Middle East and Africa, Secretary of State John Kerry told Congress on Thursday. Across-the-board cuts, known as "sequestration," set to begin on March 1, would take $2.6 billion out of the budget for the State Department and USAID, America's development assistance agency, Kerry said. ...