Which 19th century invention led to increased imperialism because of it's efficiency and better communication?

The 19th Century invention that led to increased imperialism because of its efficiency and better communication was the telegraph/telephone.

Scottish emigrants Alexander Graham Bell was the first to be granted a patent for the device in 1876. For the first time clear voice communication could be heard across long distances.  

The correct answer is the telephone.

i truly dont know the answer wait i do its 1,3,4

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