Analysts believe that the durability of the Democratic and Republican parties is due to their remarkable ability to adapt during times of crisis. These two major parties have survived many periods of social, economic, and political unrest not by maintaining a consistent ideology, but by adapting to changing needs and realigning elections. (For example, the elections of the Great Depression of the 1930s produced fundamentally new Democratic and Republican parties.) Instead of being destroyed by these elections, the parties emerged with new bases of support, new policies, and even new philosophies. Democrats and Republicans remained the dominant parties in America. After the Great Depression, the Democrats became the country's majority party and emphasized a new social and economic role for national government. The party survived-indeed succeeded-only by responding to the crisis and adapting its policies to address the current needs of the people. Such capacity for adaptation has ensured the Democrats' and Republicans' longevity and dominance in America's two-party system.