14. The __and the__ led the way for a revolution in mass
communication in the early 20th century.

the telegraph, the transatlantic cable and telephone led the way for the revolution in mass communication.

Explanation:

the telegraph was used as a form of communication during the world wars and the telephone was developed for effective communication for households.

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. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.