People across the country reacted sharply to the decision by a grand jury not to indict a white Missouri police officer in the fatal shooting of an unarmed black teenager, with protesters taking to the streets in cities from Oakland to New York. St. Louis County prosecutor Bob McCulloch announced the grand jury had chosen not to indict Officer Darren Wilson, who gunned down Michael Brown, 18, on a street in Ferguson on Aug. 9. The grand jury had options from first-degree murder to no charge at all. In New York, protesters held up a poster reading "Black Lives Matter."...