Slaves were 3.9M vs a population of 31M. They wouldn’t be able to end slavery, since they wouldn’t have been a large voting block.
It comes in many incremental steps. Renters need to rotten gradually to make themselves feel less guilty. From a reasonable renter prior to rent control to a rotten renter in deep rent control, it needs at least 2 decades and many many rotten journalists and many evil politicians to implement the brainwashing and cultural shift.
First you implement a mild rent control to make it tolerable to people. Then you fabricate a tenant-landlord incident, use the rotten journalists to exaggerate and mislead, then a hostile tenant-landlord relationship will escalate. Then you use the tenant majority and journalists and politicians to enslave the landlords.
Then you have Costa Hawkins Act to ban rent control on single family house and condos and new buildings.
Now, you just tell everyone to vote No on Prop 10 to avoid the future renters having nowhere to rent. It would be a sad state when your children have nowhere to rent and they come back to your house to take away your property while you are still alive
MTV has rent control as of 2 years ago or so in multifams.