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He stayed out for five years, winning several cases before the courts, then in 1854 he had read in the papers that Stephan A. Douglas, his political rival and Democratic senator from Illinois, had placed before Congress a bill which would reopen the territory of the Louisiana Purchase to slavery, as well as allow settlers in the Kansas and Nebraska territories to vote for themselves whether or not they wanted it, a concept which was called “popular sovereignty” by Douglas.  The resulting Kansas-Nebraska Act would do nothing more than provoke violent opposition; a border war would result between Kansas and Missouri as both pro and anti-slavery forces would cause much bloodshed; and voters in the Old Northwest, Illinois among them, would react vehemently against it, resulting in the destruction of the Whigs as a political party, and the birth of the Republicans, of which Lincoln quickly became a member.  The Dred Scott decision of 1856, in which a black man who sued for his freedom only to be told that he was never a citizen and had to remain a slave, only added more fuel to the fire, as the states were aligning slave versus free, North versus South.  

He stayed out for five years, winning several cases before the courts, then in 1854 he had read in the papers that Stephan A. Douglas, his political rival and Democratic senator from Illinois, had placed before Congress a bill which would reopen the territory of the Louisiana Purchase to slavery, as well as allow settlers in the Kansas and Nebraska territories to vote for themselves whether or not they wanted it, a concept which was called “popular sovereignty” by Douglas.  The resulting Kansas-Nebraska Act would do nothing more than provoke violent opposition; a border war would result between Kansas and Missouri as both pro and anti-slavery forces would cause much bloodshed; and voters in the Old Northwest, Illinois among them, would react vehemently against it, resulting in the destruction of the Whigs as a political party, and the birth of the Republicans, of which Lincoln quickly became a member.  The Dred Scott decision of 1856, in which a black man who sued for his freedom only to be told that he was never a citizen and had to remain a slave, only added more fuel to the fire, as the states were aligning slave versus free, North versus South.  

As the leading member of the Republican Party in Illinois, Lincoln was nominated for the Senate seat held by Douglas at the Republican State Convention in Springfield on June 16, 1858.  The acceptance speech he gave has been called the "[[House Divided]]" speech, after the opening lines:

As the leading member of the Republican Party in Illinois, Lincoln was nominated for the Senate seat held by Douglas at the Republican State Convention in Springfield on June 16, 1858.  The acceptance speech he gave has been called the [[Lincoln's "House Divided" Speech|House Divided]] speech, after the opening lines, which were based upon Matthew 12:25:

:''If we could first know where we are, and whither we are tending, we could better judge what to do, and how to do it. We are now far into the fifth year since a policy was initiated with the avowed object, and confident promise, of putting an end to slavery agitation. Under the operation of that policy, that agitation has not only not ceased, but has constantly augmented. In my opinion, it will not cease, until a crisis shall have been reached and passed. "A house divided against itself cannot stand." <!-- What Bible verse is this? --> I believe this government cannot endure permanently half slave and half free. I do not expect the Union to be dissolved -- I do not expect the house to fall -- but I do expect it will cease to be divided. It will become all one thing, or all the other. Either the opponents of slavery will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction; or its advocates will push it forward, till it shall become alike lawful in all the States, old as well as new -- North as well as South.'' [http://www.historyplace.com/lincoln/divided.htm]

:''If we could first know where we are, and whither we are tending, we could better judge what to do, and how to do it. We are now far into the fifth year since a policy was initiated with the avowed object, and confident promise, of putting an end to slavery agitation. Under the operation of that policy, that agitation has not only not ceased, but has constantly augmented. In my opinion, it will not cease, until a crisis shall have been reached and passed. "A house divided against itself cannot stand." <!-- What Bible verse is this? --> I believe this government cannot endure permanently half slave and half free. I do not expect the Union to be dissolved -- I do not expect the house to fall -- but I do expect it will cease to be divided. It will become all one thing, or all the other. Either the opponents of slavery will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction; or its advocates will push it forward, till it shall become alike lawful in all the States, old as well as new -- North as well as South.'' [http://www.historyplace.com/lincoln/divided.htm]