Why is it impossible to speak about a particular “immigrant contribution” to the United States

According to Kennedy, it is impossible to speak about a particular "immigrant contribution" to the United States because all Americans are immigrants or descendants of immigrants. ... The hope for personal freedom and the hope for economic opportunity are the two main reasons why immigrants come to the United States.

umm we do not your answer or what you are talking about

the use of “as” in the example to draw the resemblance. some more examples of common similes are given below. common examples of simile. our soldiers are as brave as lions. her cheeks are red like a rose. he is as funny as a monkey. the water well was as dry as a bone. he is as cunning as a fox. simile introduces vividness into what we say.