Hence, immigration has tended to occur in waves — most pronounced in the mid-19th century and early- and late-20th century, when the demand for labor was most urgent and jobs most plentiful.
The demands of industrialization and a corresponding need for a large pool of cheap labor acted as a magnet attracting a flood of immigration from southern and eastern Europe, to replace the upwardly mobile Irish-Americans, at the turn of the 20th century.
The demands of industrialization and a corresponding need for a large pool of cheap labor acted as a magnet attracting a flood of immigration from southern and eastern Europe, to replace the upwardly mobile Irish-Americans, at the turn of the 20th century.