What were the driving forces behind the creation of the FAA and ICAO? This question is pertaining to the airline versus FAA safety responsibilities. How do these organizations differ in the effort for safety?

What were the driving forces behind the creation of the FAA and ICAO?  This question is pertaining to the airline versus FAA safety responsibilities. How do these organizations differ in the effort for safety?You must include the reasons for your answers. In fact, the rationale supporting your answers may be more important than the actual answers.  

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