It's

 Ripple affect 

The

 Redlining 

Train horn

 Is like a reminder to not step out of the nigga line every time I hear it 

I'm

 Still a nigga 

600 yrs of slavery

 It didn't start with me I wasn't the first slave 

Signal me

 When you see the problem coming 

Warning

 Here is the problem we see the problem a mile 

Away 

It's marked on my forehead

 Problem 

If you look up the word problem

 I'm sure it's a picture of me 

I'm a problem

 For you to you 

The problem is me

 That should make you feel better