Which of the following inventions by men has had a great effect on improving int

Question:

Which of the following inventions by men has had a great effect on improving international communications?

Best Answer - Chosen by Asker: Your question is worded rather awkwardly as you list no inventions following your question. I would say the greatest leap forward in international communication came with the telegraph because it was the first means of instantaneous communication.
Soon after the telegraph was invented the continents and oceans were laced with communication wires.
For thousands of years before the telegraph there were only hand written and hand delivered messages.
Following quickly were telephone, radio, television, and the internet but it was the telegraph that brought mankind into the age of communication.