well, this strategy was all laid out by the designer of the american constitution over 200 years ago in the federalist papers (the ones written by madison) and his notes on the constitutional convention. Madison wrote that the primary purpose of the structure of the american govt under his constitution was to preserve wealth inequality. Madison wrote that the way to do this was to prevent the majority from uniting and discovering their common interest. The way he proposed to keep the majority from uniting was to create factions in voting districts by creating enlarged voting district (federal districts). Thus enlarged, the districts would have more factions and that would "protect the minority of the opulent against the majority" (to quote madison).

Also useful in preventing the majority from using the government against the minority of the opulent was the pseudo-democratic structure of the federal govt (strong checks and balances and separation of powers). This would hinder the ability of the majority to control the government. That would keep the wealth of madsison, jefferson, washington, morris et al., safe from that dirty, brutish mob (i.e., you and me).

The benefit to the elite of factions created by nation enlargement? The elite get to keep more of their wealth.

As the USA grows larger and more heterogeneous with mass immigration, we are less and less in control of our own govt.

Our cultural cousins in the rest of the western nations (canada, australia, UK, scandanavia, france, austria, germany etc) are all smaller and more homogeneous, and so the majority there therefore have more control of their own nations. However, as they elite cram more immigrants into those nations, factions grow and there is less majority control. And of course the elite created the EU along the lines of the USA so as to remove as much power as possible from the majority in those member nations.