How did the invention of radio contribute to a national American identity? A.
Americans began to develop a shared culture across state and regional lines.
B.
Television became the centerpiece of the average American living room.
C.
Blacks and whites saw their racial divide disappear thanks to mutual interests.
D.
National celebrities and sports figures became well-known throughout the country.

A.  Americans began to develop a shared culture across state and regional lines.

Explanation:

Radio was invented by Guglielmo Marconi around 1895 - 1896 and commercially used in 1900.

Radio came with benefits to the society and also contributed to a national American identity by sharing the cultural values across state and regional lines. Radio mix the culture in airwaves and sent it to every home around the country, that develop a shared culture across state and regional lines.

Hence, the correct answer is "A.  Americans began to develop a shared culture across state and regional lines."

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