During the 1920s, many Americans invested in the stock market because

While African American workers faced discrimination and limited opportunities, many were not entirely denied employment in defense plants. In fact, the war prompted some defense industries to hire African Americans in greater numbers, particularly due to labor shortages, though they still encountered significant barriers and segregation.

This choice misrepresents the situation; during the war, many states actually relaxed child labor laws to allow teenagers to fill labor shortages. There was an increased push for youth to work, especially in agricultural and industrial sectors, rather than a tightening of laws to keep them in school.

While there were programs like the Bracero Program that facilitated the legal entry of Mexican laborers to work in agriculture, the statement implies a struggle that is misleading. The government actively sought to bring in Mexican workers to address labor shortages in agriculture, rather than struggling to prevent their entry.