In the 1800s, both “old” and “new” immigrants to the united states faced hostility because of

In the 1800s, both the "old" and the "new" immigrants to the United States faced hostility because of cultural, religious, linguistic, and skin color differences.

Explanation:

The arrival of millions of immigrants from all continents of the world has formed, in the United States, an ethnically diverse population. For many centuries, however, the white population of British descent dominated the country, marginalizing the other ethnic groups. Under the acronym WASP (white, Anglo-Saxon, Protestant) there was a strong sense of racism in the country. Other European immigrants, such as Germans, Irish and Italians, were considered inferior, mainly because they were mostly Catholics. However, with the passing of the generations, these have become diluted within the population. For blacks, the situation was arduous since, until the 1960s, African-Americans were considered by law to be inferior to whites. The Rockers, in turn, were considered "unassimilable" and were massacred by the millions. The country based its racism on laws, such as "One Drop Rule". Such a law provided that anyone who possessed a drop of African blood was automatically black and therefore biologically and legally inferior.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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