By Julia Harte and Rich McKay NEW YORK (Reuters) -Millions of Americans awoke on Tuesday to snow, freezing rain and frigid temperatures as an Arctic blast gripped much of the United States, ending a nearly two-year “snow drought” in New York City and putting much of the West into a deep freeze. Record-breaking cold was expected across the Rocky Mountains, Great Plains and Midwest, with wind chills below minus 30 degrees Fahrenheit (minus 34 degrees Celsius) reaching the mid-Mississippi Valley in the morning. The lowest temperature in the country on Tuesday morning was -36 F (-38 C) in the smal…