Answer:
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In 1860,Abraham Lincoln was elected as U.S. president but his election was accepted by many southern states who decided to secede from the U.S. and form the Confederate States Of America with 6 other states(and eventually 11 all together)
cause-Lincoln had only won the election with 40% of the popular vote,which meant that the majority of the country did not support his ideals-especially anti-slavery sentiment.
They were the first American expedition to cross what is now the western portion of the United States.
during times of war The two that I know most about are his suspension of Habeas Corpus and then his issuance of the Emancipation Proclamation. On the first issue, people will often discuss that Lincoln unlawfully suspended the writ of habeas corpus during the war thus violating American Constitutional rights.