During the second major wave of immigration, from the late 1800s to early 1900s, immigrants to the united states came mostly from

Scandinavia, Italy, Poland, and Russia.

Explanation:

Unlike earlier immigrants, the second wave brought people mostly from non-English speaking southern and eastern Europe countries.  The principal source of immigrants was Scandinavia, Italy, Poland, and Russia. Also, Austria-Hungary, Bulgaria, Greece, Portugal, Rumania, Spain, and Turkey. Coming from very different cultures, with other languages, made new immigrants struggle to adapt to life in the US.

the term is einsatzgruppen

the industrial revolution pushed the world into modern industrialization. it changed the course of history profoundly. it caused rapid urbanization and pushed cities and countries into development. the industrial revolution began in great britain with a series with new inventions which led to the creation of machines and mass production.

this caused the country to gain wealth and money and become an international superpower. it improved transportation and manufacturing inside the country, pushed people to live in urban areas and britain to become the most powerful nation in the world for a while.