How does gritting the roads work?

What did George Washington lead during the American revolution? What group was not affected by The Johnson-Reed Immigration Act of 1924? What role did Gustav Stresesmann play in the development of the weimar republic? What kind of atrium was in the House of the Silver Wedding? What name did a Roman slave have? What accounted for the appeal of Ronald Reagan and his policies to the American electorate in the 1980s? What were Lewis and Clark's wives' names? How does the recipient of both a Bronze star with V device and a Bronze Star for merit display the ribbon on the dress uniform? What was the most controversial treaty written in the paris peace conferance? What naval hero during the Revolutionary War said I have not yet begun to fight? Some borders are straight because they were made by? What were drawbacks to Americans industrialization and expansion? The first and most famous defeat of the Texans occured at a Spanish mission called? Who had the longest reign of the byzantine empire? What following item was a factor in ending the alliance between France and the US? What were the fielding stats for baseball player Manny Machado playing at third base for the Baltimore Orioles in 2012? What alphabet do the Yemen's use? How do you say people armed themselves in French? The Marshall Plan attempted to prevent the spread of communism in Western Europe by? What is JABULANI?