The post title doesn't match the website, which uses only the vaguer "if history turned out different" description. Especially clear when it shows Spain as ruled by African kingdoms, South-Eastern Europe under Ottoman rule, and talks of 'European subjects' (I guess the artist didn't want to invert decolonization).

By now, seeing how selective condemnation of colonialism and slavery are (sometimes even turning into praise, such as with Spain/Al-Andalus, described as a "center of learning" by wikipedia, relegating the slavery of Spanish natives to footnotes), their real targets should be obvious.