I'm struck by Russia's huge size compared to the other great powers, and the rather low population of Mexico compared to today. These population pressures drive immigration patterns at least as much as any alleged disloyal politicians.
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Russia back then had Ukraine,Belarus,Poland,Finland,"Rep.Moldova",Centr al Asian states etc. Still they would have had much much more ethnic Russians today if not for World War 1,the Bolshevik Revolution and World War 2, same goes for all Europeans,the two World wars really fked us up as a group.
About Italy, a recent demographic study has shown that without mass emigration (italian diaspora), WWI and WWII, the population would be about 170,000,000 (!).