Below are links to articles published by the CDC about public health’s achievements in the United States. Here is a link to the introduction to the set of articles.
Achievements in Public Health, 1900–1999: Changes in the Public Health System
From 1999 to 2009, the age-adjusted death rate in the United States declined from 881.9 per 100,000 population to 741.0, a record low. It lists the ten great public health achievement of 2000 through 2010 as:
Ten Great Public Health Achievements — United States, 2001–2010