Why did southern legislatures enact Jim Crow laws after Reconstruction?

Jim Crow laws were state and local laws that enforced racial segregation in the southern United States. These laws were enacted in the late 19th and early 20th centuries by white southern democrat dominated state legislatures to disenfranchise and remove political and economic gains made by black people during the reconstruction period.

Was giving by lincoln on march 4, 1865-as lincoln prepared to speak, the civil war was drawing to a close-lincolns address of 703 words was the second shortest inaugural address-lincoln mentions god 14 times-505 of the words were one syllable -he used the word "war" or it's pronoun 9 times