Homologous chromosomes may exchange segments, this is called crossing over. Crossing over increases genetic variability
Where would you add crossing over" to the Venn diagram?

Meiosis

Explanation:

Crossing over of a chromosome always happen in meiosis 1. The material between the different sister chromatid in exchanged, so each gamete will be different of each other.

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.