At the beginning of the 20^thcentury, the leading cause of death in the U.S. was .

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At the beginning of the 20th century, infectious diseases such as pneumonia, tuberculosis, and influenza were the leading causes of death in the United States. This was due to a lack of effective vaccines and antibiotics at that time. It wasn't until the mid-20th century that chronic diseases such as heart disease overtook infectious diseases as the leading causes of death.

At the Beginning of the 20th century, the Leading Cause

At the Beginning of the 20^thcentury, the Leading Cause