Are you asking a question is so what the answers?? To the question
Also arrived were Poles, Russians, French (more than 100,000 each), Germans and Austrians (also more than 100,000), Portuguese, Greeks, Ukrainians, Croats, Czechs, Irish, British, Swiss, Dutch, Hungarians, Scandinavians (the vast majority being Danes ) , and people from other European and Middle Eastern countries, ...
Answer:
'Mucho gusto' is what is commonly spoken -- though 'encantado' is still technically correct; it's quite old-fashioned or outdated. (And when it <em>was</em> common, say 50 - 100 years ago, a man would say it to a woman, not a man to another man.)
Explanation: