The “third” wave of immigrants came mostly from where?

They mostly came from Eastern and Southern European cities.

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"Third" wave immigrants came mostly from South and East of Europe.

Explanation:

"Third" wave of immigration, which took place roughly between 1850 and 1930, originated from Southern and Eastern Europe. It is estimated that approximately 25 million people arrived during that period, with a large number of Italian immigrants (mostly Catholics) and many nationalities of Eastern Europe, including Poland, Hungary, Romania, Czechoslovakia, Russia and Baltic nations.

there were abundant sources of fuel nearby

the two things that develop a strong social foundation are: a. separation of church and states e. education received attention separation of church and states separate the illogical  argument that came from religious beliefs to a fact based belief. while education will make us remember the past to avoid the repeat of our mistakes.