key factors that influenced the evolution of the U.S. health care delivery system

NEEDED BY 11/16/2017 8AM 

Select and describe one of the key factors that influenced the evolution of the U.S. health care delivery system to what it is today. 

What challenges and opportunities are still relevant? 

How is the selected key factor affecting health care delivery today? 

How might it affect future health care delivery?

- Use at least 2 APA refernces 

- Answer questions straight to the point