Easy; the colonial era (so right around 1500). Movement of wealth before then was limited by zero-sum resource conflict and patriarchal inheritance of the nobil

Easy; the colonial era (so right around 1500). Movement of wealth before then was limited by zero-sum resource conflict and patriarchal inheritance of the nobility. But the new world opened up a way for noble second and third sons (who were trained and had the resources) to build their own fortunes if only they can be ruthless enough in seizing them.