The USA Constitution states that everyone is equal, but many groups in America in the 1920s were not treated fairly. There was a great deal of prejudice against those who were not considered 'real' Americans.
Open door policy
At the end of the nineteenth century, the USA had an Open Door policy which encouraged immigration. By 1920, more than 40 million people had arrived. A combination of push and pull factors made people emigrate to the USA. The push factors made people want to leave their own countries, and the pull factors attracted them to the USA. The main reasons were: escaping from poverty in their own country and the hope of equality of opportunity.