There were many reasons. For starters, it involved getting rid of a large number of Native Americans, and while some supported this, others opposed it as they were peaceful. Another thing was that this meant the introduction of new states and it deepened the division based on whether the states should be slave states or non-slave states. Also they involved war with Mexico and some wanted this and some didn't.
It should be noted that the impact of World War II was destruction to the world's population.
World War II can be regarded as a global war which was recorded as the deadliest military conflict in history.
During this war there was;
- deliberate genocide
- massacres
- mass-bombings
- disease
- starvation.
Therefore, World War II was destruction to the world's population.
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The answer would be the third one
No reinforcements were used by Union forces, thinking they weren't needed.
The North had thought, going into the Civil War, that victory would be relatively easy to achieve. According to the History Channel, the outcome of the battle (a victory for the South) "sent northerners--who had expected a quick, decisive victory--reeling."
The First Battle of Bull Run is called the First Battle of Manassas by Southerners, after the city near where it was fought. The battle took place in Virginia in July of 1861. The Confederate forces received reinforcements during the battle and that helped them in achieving the victory.