The fourth alternative is correct (D).
Immigration is a transformative force that produces profound social changes both in the country of origin and in the host country, in the relations between the different groups within the host societies and between the immigrants themselves and their descendants.
The Immigration Act of 1965 abolished old practices of immigration quotas. This law repealed a racist rule of 1924 that imposed quotas by country of origin.
This Act proves a fundamental characteristic of United States history, which was the extraordinary capacity to absorb millions of people from all classes, cultures and countries, becoming the nation that welcomed the largest number of immigrants.
