Final answer:
The original Social Security Act of 1935 excluded agricultural workers, domestic workers, and those in casual labor from Title II benefits, which disproportionately affected women and African Americans.
Step-by-step explanation:
The original Social Security Act of 1935 was groundbreaking legislation designed to provide a safety net for various vulnerable populations. However, not all groups were included under its protections. Title II of the act, which established old-age benefits, specifically excluded agricultural workers, domestic workers, and those employed in casual labor, which disproportionately affected women and African Americans. This meant that a significant portion of the working population, including at least 60 percent of the nation's black population, did not initially receive Social Security benefits, thus not addressing some of the most needy populations during the Great Depression.