European and American population scales in relation to economic diversity

I wonder if there is a connection between the fact that Europe has countries with more similar population sizes and more equitable distribution of wealth within and between countries (than in the New World). In the Americas, there's "America," powerful and confident enough to call itself by the name of both continents, and there's all the others with far fewer population sizes, and much weaker economies. Within these countries, as well, there's more disparity of wealth. Is the greater economic equality of Europe contributing to a psychological acceptance of or demand for equality? Has the inequality between the Americas normalized internal inequalities? Has the exceptional wealth of the US simply attracted more people, contributing to its large population size, independently of internal politics? Are all the American economies based on resources and immigration first and foremost, and long-term economics second?

Has anybody noticed that the word "equality" has almost vanished from public discourse? It's more taboo than the word "liberal".