What exactly overwhelmed Florida's railway system? a, the number of tourists
c. the need for new railroad cars
b. the demand for building materials d. the amount of hot weather

B. The demand for building materials

Explanation:

The demand for housing was so high that the cost of rent soared. Because the speculators had inflated the economy, many American who had migrated to Florida could no longer afford to live here. At the same time, the demand for building materials overwhelmed the railway systems that transported them here.

It loosened immigration restrictions

It resulted in a surge in immigration, especially from Asia and Latin America.

Explanation:

The United States had very strict laws regarding immigration and naturalization. It ensured preference was given to individuals which had the American background.

Immigration and Naturalization Act of 1965 ensured that the immigration laws were loosened and resulted in a surge in immigration, especially from Asia and Latin America. It helped people reunite with their families in the country.