The primary purpose of the hawley smoot tariff of 1930 was to heavily restrict imports to the United States, making it easier for people to find jobs domestically. It was seen as a huge failure, however.
Answer: France
France began development in late 1915, eventually creating the Renault FT light tank. This was the first to use a fully rotating turret that contained the tank's main armament - the basis of tank design ever since. Over 3,000 of these machines were made by late 1918.