The experience of farmers, coal miners, and union laborers during the 1920s was primarily characterized by financial hardship.
Many farmers faced falling crop prices and mounting debts, as the post-World War I agricultural boom ended, leading to widespread foreclosures. Coal miners dealt with declining demand for coal and low wages, facing harsh working conditions and a lack of job security. Union laborers, while fighting for better wages and working conditions, often encountered resistance from employers and public disapproval, which exacerbated their financial struggles.
While public disapproval and federal assistance were also factors in their experiences, the overarching theme during the 1920s was the significant financial challenges they faced.
Thus, the correct response is financial hardship.