用英语解释两个名词：the great depression和new deal

The United States hasn't grappled with deflation since the Great Depression in the 1930s,in others words,it is when life was hard for most westen people 。New DealRoosevelt New Deal,deals with the Great Depression had left behind plenty of important landmarks,from the Appalachian Trail to Hoover Dam,and now the American New Deal stands for ingenuity,hard work,and fighting spirit。