Economic hardship, such as high unemployment and economic recession, can lead to social and political unrest, which can result in the transformation of political regimes. In Europe, the aftermath of World War I and the Great Depression of the 1930s were significant periods of economic hardship that contributed to the rise of extreme political parties and the transformation of political regimes.
In the United States, extreme political parties have not been as popular as they have been in Europe. One reason for this may be the stability and relative prosperity of the United States compared to many European countries. The United States has a long history of democratic governance and a stable political system, which may have contributed to a lower level of support for extreme political parties. Additionally, the United States has a history of political polarization and a two-party system, which may have limited the ability of extreme political parties to gain a foothold in the political landscape.