Here's one Leonidas W. Spratt complaining to a friend in 1861 about how "poor white people voting" was an existential threat to slavery.
Source: @KeriLeighMerrit's Masterless Men
• is very new (maybe 5-6 generations old)
• has nothing to do with natural allegiance to one's own race or w/e
• had to be socially engineered into existence.
Poor whites hated slaveowners, & slavers were terrified of poor whites having real power. Slavers waged decades of propaganda + terror campaigns to push poor whites into accepting their rule.