East St Louis is a sad story. In the 40s & 50s it was run by the Buster Wortman mob. The area (St Clair and Madison Counties) had the revenue and political influence equal to Cook County/Chicago. The National Stockyards and the resulting banks there, were the cash cows. During the race riots of the 60s, E St Louis was "burned to the ground". The "Big Money" left town and never rebuilt. Then anyone with even a little money, got the hell outta there (white flight). The rioters "won". They took over East St Louis. 50 years later, it's still a (to quote silentbuddha) fucking shithole.
Fast forward to 2020 -- I fear history is repeating itself in Baltimore, Seattle, Minneapolis, etc. Ferguson was surely a "repeat". Nothing has been rebuilt there since its burning in 2006.
BTW -- East St Louis has been a strong Democrat stronghold since the 60's.
The City of St Louis has TWO political parties: White Democrats and Black Democrats.