By Sarah Kinosian and Vivian Sequera (Reuters) – U.S. and Mexican authorities recently announced a new policy that would expel Venezuelans entering the U.S. land border back to Mexico, but allow up to 24,000 people from the country to apply for humanitarian entry into the United States by air. As a result of the new policy, thousands of Venezuelans believed to be en route to the United States are now stranded between the two countries during a year when Venezuelans are arriving at the U.S. border in record numbers. WHY WERE THE NEW MEASURES PUT IN PLACE? The measures respond in part to politic…