Answer:
Defeat at the battle of Gettysburg
Explanation:
The battle was a crushing defeat for the Confederacy. Union casualties in the battle numbered 23,000, while the Confederates had lost some 28,000 men–more than a third of Lee's army.
Answer:
Many Americans left farms and headed to the cities because the industrial revolution opened up many jobs in the cities. Also, the industrial revolution created more farm technology that allowed farmers to do the day's work with fewer people. This led to mass unemployment and peoples' dispersal into cities. This also caused cities to grow.
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The immediate result of trench warfare was that combatants on both sides were largely shielded from small arms and artillery fire, which prolonged the fighting and the war.