How might the culture of the united states be different if immigrants were not an integral part of its history?

Immigrants Expand Culture by Introducing New Ideas and Customs. Trump said that immigrants change the fabric of a society's culture. ... In reality, immigrants change culture for the better by introducing new ideas, expertise, customs, cuisines, and art. Far from erasing the existing culture, they expand it.

Explanation:

the social historical theory explains the creation of the varnas, jats and of the untouchables. according to this theory, the caste system began with the arrival of the aryans in india. the aryans arrived in india around 1500 bc. the fair skinned aryans arrived in india from south europe and north asia.

im pretty sure the answer is b, i hope i < 3