Why do you think Italian Americans and German Americans would be discriminated
against?

They would most likely be discriminated against for religion, drinking, politics, and "stealing" of jobs.

Explanation:

During the mass immigrations that occurred during the American Industrial Revolution, many German and Italian (along with Irish) immigrants came to America in search of factory jobs and cheap land. They suffered from a lot of discrimination, however, as many "native"-born Americans felt that these immigrants were taking their jobs, because the immigrants would work without rest for low costs with the hopes of getting enough money to make a name for themselves in this new country. Many of the immigrants were Catholic, which was uncommon among Americans and another cause for discrimination. Also, the "heavy" drinking habits of the immigrants (specifically males) was a subject for jest among Americans, and the fact that the immigrants were allowed to vote, while having what Americans thought of as "low to no" knowledge of American politics and politicians whatsoever was threatening to us and caused some tension and hatred between the groups.

the three roles stated in the dialogue develop the siblings' personalities.

lloyd's personality looks like a trademarketer

dana's personality is afraid from lloyd's behavior and the oldest sister is a decided person who tries to solve any conflict