What was impact of the use of machine guns and barbed wire during world war 1

While it made elimination of enemies more quickly, it actually prolonged the war.

Machine guns used a link chain that passed through the gun chamber and fired at an extreme rate. By WWI, the main gun was based off of the Vickers machine gun, which was extremely more moblie and had a faster rate of fire than the weapon previously (Gatling gun in the American Civil War).

Barbed wire had a lesser impact, as they allowed the slowing of movements of troops early in the war, but with the technological advancement of tanks and the such, the role of barbed wire dropped, though it was still used extensively throughout the European front.

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a. favoring native born americans over immigrants.

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.