In the 1800s, what new technology nations build and maintain their empires? machine gun railroad telephone telegraph

The correct answer is A) machine gun.

In the 1800s, machine gun helped nations build and maintain their empires.

A machine gun is an automatic firearm. The machine gun was designed to shot rapid fire, which means to fire rifle cartridges in high-speed succession. It contains what is called an ammunition belt for continuous firing.  

By the 1800s, the machine gun was part of the new technology applied for war purposes. It really was a clear advantage for armies that possessed this kind of weapons. This technology resulted in nations conquering new territories and maintaining the ones that were already in its possession.

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