According to a recent analysis of vital statistics...

... the age-standardized death rate per 100,000 including all causes fell by 42.9% from 1969 to 2013. Specifically:

• deaths from stroke decreased by 77%
• deaths from heart disease decreased by 67.5%
• deaths from unintentional injures decreased by 39.8%
• deaths from cancer decreased by 17.9%
• deaths from diabetes decreased by 16.5%
• however, the death rate for chronic obstructive pulmonary disease (COPD) doubled

Source: "Mortality Trends and Signs of Health Progress in the United States," the Journal of the American Medical Association (JAMA), abstract only, October 27, 2015, http://jama.jamanetwork.com/article.aspx?articleid=2466099