What was an effect of the immigration laws of 1921 and 1924?

One of the most important effects and significance was the use of the US 1890 census, rather than the population census of 1910 or 1920, it excluded the new wave of foreign-born from South-Eastern Europe from quotas truly proportionate to their new numbers in the population. The effect on immigration from Europe is conveyed in the picture on the right.

Algunas consecuencias son que la population aumento y esto resultó que hagan más casas y eso causó que los recursos naturales disminuyan. Igualmente el uso de carbón malamente influyó en el aire que causó la contaminacion