Question

What inventions were made because of the telegraph?
Reed
What does your text say? Since the electric telegraph was the first invention to use electronic transmission by wires, what else uses such transmission? The telephone, cable TV, what else?
Reed
Even your Wi-Fi sends a radio signal to the modem from your computer, then it connects to a wire.
Reed
Well, it may be a fiber-optic cable now, but the basic idea is the same.