Give one example of how the role of the federal government regarding Medicare and Medicaid has expanded since the 1970's or since the passage of the...

Give one example of how the role of the federal government regarding Medicare and Medicaid has expanded since the 1970's or since the passage of the Affordable Care Act. Give one example of how health services research has been influenced by the expansion of the government's role. Do some research to provide information for this response. Reference the sources.