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Final answer:

Radio technology and the automobile were the two key inventions that significantly impacted American life in the 1920s.


Explanation:

The inventions that drastically changed American life in the 1920s were:

  • Radio technology: The development of commercial radio networks and popular programs revolutionized communication.
  • The automobile: The widespread ownership of automobiles symbolized middle-class life, transforming transportation and urban planning.

Learn more about Significant inventions in the 1920s here:

https://brainly.com/question/15120101


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