Mountains are good for defense during warfare. It makes it more difficult for intruders to penetrate the city/state/country. However, mountains are barriers for trade, prevent farming, and isolated the city/state/country.
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Some positive effects of the Reconstruction include uniting the country and blacks had the right to vote as well as be elected for political offices. Its negative effects, on the other hand, include the South being faced with economic turmoil.
Octavian helped bring Egypt and the Eastern Mediterranean firmly under his control; tragically, it brought the death of Mark Antony and Cleopatra.
The Manhattan Project grew to employ more than 130,000 people. The product was used by the US, Canada and United Kingdom's ARMY as their weapon.
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there werent any airplanes u loser EDIT; no you idiot the Wright Brothers made the airplane in 1903 and WW2 was in 1945. The positive effects were that we had bombs that we could drop on the Germans and the negative effects were that the airplanes could crash. so shut up -.- Edit: Dude The other edit person is totaly right the wright brothers created the airplane on December 17, 1903. and the airplane has been in us ever since. dude haha So Lyke shut up iam nawt a los8r :P yuu r!! -_-