Until the 1980s, which company controlled more than three-fourths of American phone lines?
A) AT&T
B) MCI
C) Sprint
D) Verizon

Name: Until the 1980s, which company controlled more than three-fourths of American phone lines? A) AT&T B) MCI C) Sprint D) Verizon
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AT&T had a virtual monopoly on telephone service in the United States until the 1980s, controlling more than three-fourths of the country's phone lines. This monopoly was broken up in 1984.

Until the 1980s, Which Company Controlled More Than Three-Fourths of American