What are the disadvantages and advantages of immigrants to The US?

Whenever you have immigrants coming to the US, there is always a cultural interaction; new ideas, languages, and ways of looking at things help the country. From an economic stand point, many immigrants come here looking for work. If they do it better for a cheaper rate, it increases the productivity of the nation, which is a good thing. Unfortunately, the people who lose their job have to look for other ones, which is difficult. Still, progress is ultimately a good thing, so if immigrants can do a better job, they should be able to do it, and the replaced person should find something they else they can do. The US used to require about 90% of people to farm to provide food for the country. Now it's only about 2%, but that doesn't mean we are worse of because 88% of the country lost their jobs; they found other services they could provide, and we are better off for it (we now have things like computers, cars, airplanes, and movies). In the same way, immigrants help our country as a whole, by letting us be more efficient at producing things of value.