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It was a war between Mexico and the U.S. over a border dispute on the Texas-Mexico border. It was important because the U.S was able to get even more territory because of the war which started further questions about slavery.

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In the Compromise of 1850, California was added as a free state, a new Texas-New Mexico boundary was defined, it let Utah and New Mexico to decide whether they wanted to be free or slave, and made it easier for slave owners to recover runaways under the Fugitive Slave Act of 1850. This compromise was important because it contained the Fugitive Slave Act which angered Northerners.

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1854
It was an act that organized the territories of Kansas and Nebraska and made it to where the slavery issue would be decided by popular sovereignty.
It is important because it ended up starting conflict in Kansas.

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1854-1861
Bleeding Kansas was a mini civil war fought in Kansas over the issue of slavery. It is important because it increased the animosity that pro and anti-slavery groups had towards each other.

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Oct 16, 1859 – Oct 18, 1859
Was an attempt by radical abolitionist John Brown to try to start a slave revolt. It was important because it was considered a prelude to the Civil War.

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1861-1865
War between the rebellious South who were worried that there way of life was being threatened and the North who wanted to preserve the Union and abolish slavery. It is important because it is one of the bloodiest wars in American history and led to the slaves in the South being freed.

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1865-1867
Reconstruction that included a lenient return for the Confederate states. Land was given back to its pre-war owners and state governments were given free rein to rebuild themselves. The effects of this Reconstruction are that the South was able to pass Black Codes which angered Northerners and made Johnson fall out of favor with Congress.

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1867-1874
Started after the Radical Republicans got angry at Johnson. The Radical Republicans were less lenient when letting the rebellious states return to the Union. One of the requirements that they had for the South is that they had to pass the 14th amendment in order to be readmitted.
It was important because it led to freed slaves in the South being able to participate in democracy for the first time in history.

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Financial crisis that started an economic depression in Europe and North America. It is important because it made Republicans lose interest in Reconstruction.

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In exchange for Hayes being elected president, Hayes promised to end Reconstruction and stop meddling in the South. It is important because it led to troops being removed from the South and Reconstruction officially being ended.