Why did immigrants have to undergo health inspections?

Immigrants had to undergo health inspections primarily to prevent the spread of Infectious Diseases and to protect public health. During the late 19th and early 20th centuries, outbreaks of diseases such as tuberculosis and cholera raised concerns about the potential impact of large waves of Immigration. Health inspections aimed to identify and isolate individuals who might pose a health risk, ensuring the safety of both the immigrant population and the existing residents. Additionally, these inspections helped manage the flow of immigrants into the country by determining their eligibility for entry.