The Question:

What were the first U.S. cities linked by a transcontinental phone line?

The Answer:

On Jan. 25, 1915, the first official transcontinental phone call was made between Alexander Graham Bell in New York City and Thomas A. Watson in San Francisco. Using a replica of the first telephone, Bell said "Mr. Watson—come here. I want you!" This was the same request that had been been transmitted between the duo in the first telephone conversation, on March 10, 1876.

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—The Fact Monster