In one to two sentences, describe contributions made by immigrants in America

The more immingrants that came to America allowed for more jobs and mopre cultural influence. Many immigrants that came from poor European countries worked the factory jobs that no one else wanted.

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on