1. The Emancipation Proclamation was not prior to nor at the inception of, but during the Civil War. It was not enforced (nor could be) and served basically as a thumb in the eye of the Confederacy. The slaves were still freed after the war, STILL, and that was in an effort to destroy the economy of the South and punish it.
2. There was no Democrat Party in the Confederate States STILL.
3. Jim Crow was enacted by Democrats because there was effectively no other party in the racist South, Blacks and poor Whites disenfranchised by the powers that be, rendering the Republican Party nonexistent there.
The South did not turn Republican till 1964 (not the 1990s). voting for Republican Barry Goldwater who oppossed Civil Rights legislation (on the grounds that it put too much power in the hands of the Federal Goverment, not because of what it stood for) while Johnson supported it and later signed it STILL.
4. The War on Poverty was spurrred by a reaction to poor Appalachians STILL, which JFK witnessed first hand in 1960 and the rest of America witnessed via pictures in the 1964 Life Magazine article titled, "The Valley of Poverty."
That "I'll have them..." alleged President Lyndon B. Johnson quote was first reported in 1995 by someone who claimed to have overheard him say it to two (unamed) Governors. It has never been corroborated. (LBJ has said a lot worse)
However, it is a fact that LBJ once did say, "If you can convince the lowest white man he's better than the best colored man, he won't notice you're picking his pocket. Hell, give him somebody to look down on, and he'll empty his pockets for you." You and your ilk have proved that correct.
After signing the Civil Rights Act, he told WH Aide Bill Moyers, "I think we just delivered the South to the Republican Party for a long time to come."
5. NYC, LA, SF, etc, STILL.
6. Detroits decline began with migration outwards to the suburbs STILL, factories following them. The core of Detroit was gutted as they moved out and other business that benefited from the money flow followed them. Poor folks from the South (all colors, btw) who bought houses cheaply in Detroit were now stuck unable to sell them, not that they could afford to live in the burbs to start with. Mass transportation in Detroit sucks, and these people were stuck.
Read a book? Wish I said that, oh wait, I did, and, yes, I did.
You should try it one day.