Intersectionality, like Identity, was stolen by the 'left' from the Modern Right. It goes to show the Right was sounder on fundamental matters of power and politics. Nevertheless, the 'left' gave the themes of identity and 'intersectionality' its own perverse twist, rendering them even more problematic and useless for the preservation of stable socio-political systems.
There was a time when the Left used to denounce the politics of identity as tribal, atavistic, reactionary, particularist, and xenophobic. The Left urged all of mankind to forgo their cultural identities and tribal-ethnic-national affinities and become part of Universal Man. For Marxists, this meant the brotherhood of workers around the world. It didn't necessarily mean dissolution of borders, but it meant people around the world would formulate their identities on the basis of class than race, ethnicity, or nation. So, the working classes of all races, nations, and cultures would form an alliance against all repressive elites regardless of race.
Among the capitalist liberals, the universalist project was essentially be elitist(or bourgeois). They called it cosmopolitanism whereby the best educated individuals, being so knowledgeable and sophisticated, would dissolve traditional or tribalist notions of identity. Committed to meritocracy and excellence, these cosmopolitan elites would find value and form companionship based on comparability of skills, talent, and interest than on something so crude as ethnicity, nationhood, and tribalism. In time, with expanding economies and rising educational attainment among the middle classes, the ideal of cosmopolitanism would go from an elite privilege to a mass reality if all worked according to plan.
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