The social environment, the mass media, and interest groups are three factors that influence public opinion. Which of the three do you
think is the most important?

I think that the media has the biggest influence over how Americans think this day in age.  While it showcases some good, the media has the power to choose how Americans think, making many gullible.

Explanation:

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.