socioeconomic factors o algo

>>223957508
Detroit was a manufacturing hub, and everyone who COULD leave could, leaving behind the poor negroes. Windsor had a more diversified economy.

Post-War Detroit hand-built most cars on the planet. The rise of automation, more complicated and geographically diffused, but ultimately more efficient, supply chains and the Japanese and German auto industries eviscerated Detroit's supply of jobs.
The deep south had an African population dating from the days when Chatham was the southern frontier of the empire, however they had already moved on to Hamilton, Toronto, Montreal, Halifax, the West Indies, Sierra Leone, or returned to the United States after the emancipation proclamation. The only minorities in Windsor were a shrinking French enclave and some southern Italians and central Europeans who came after the war. With less jobs vanishing and less ethnic conflict, the city centre wasn't gutted by the 'white flight' that killed Detroit.

Ku Klux Klan terrorizing the inhabitants of Detroit and burning down their homes and shops for generations

The above comments mention white flight, but the more direct answer is that US auto manufacturing began declining in the 1970s with the oil crisis. With fewer cars sold, there were fewer jobs for skilled labor. Those people left, but the infrastructure that needed maintenance still remained (roads, plumbing, electricity, etc). When you have infrastructure for 10 million people but only have a tax base of 4 million people, your city government can't afford to maintain it all and goes broke. Windsor has a completely separate tax footprint even though it works in similar sectors so it was not impacted nearly as much. It wasn't some negro boogeyman, it was macroeconomics and being too centralized on a single segment of the economy.
Detroit was only peak shithole in the 90s, prolonged by the 2008 crash. It has gone through significant revitalization efforts, and still better than other large cities like Denver, St Louis, or San Diego.