During the third wave of immigration how did private companies advertis to potential immigrants

The third Wave occurred during the dethrone of dictatorships in the 1970s in Greece, Spain, and Portugal; it refers to the third wave of democratization and came from Eastern and Southeastern Europe. So, private companies did advertise the potential immigrants because of the thing that everyone living in America was all rich.

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.