The act of 1924 placed quotas for ethnic groups based on the proportion of americans from each nationality resident in 1890, thereby severely limiting the number of whites considered to be of "lower race," that is, those from southern and eastern europe.

Here the the correct answer is the Immigration Act of 1924 or as it is also known Johnson-Reed Act.

This act limited number of new immigrants, who would be admitted on the yearly basis, to 2% of the already existing US population, as determined by the 1890 census. This is a really low number and a decrease considering that the previous quota was 3% of the population.

South carolina was so angry about the election of lincoln that they seceded from the union on december 20, 1860. they attacked fort sumter later, on april 12, 1861.