The act created immigration guidelines that gave preferred status to skilled workers and immigrants with families in the us. a. immigration b. hart-celler c. chinese exclusion d. national origins

The Hart-Celler Act created immigration guidelines that gave preferred status to skilled workers and immigrants with families in the US. Option B is correct.

The Hart-Celler Act, also known as the Immigration and Nationality Act of 1965  constituted a federal law that the 89th United States Congress passed and which was signed into law by President Lyndon B. Johnson which abolished the National Origins Formula.

The Hart–Celler Act amended the Immigration and Nationality Act of 1952.

b

Explanation:

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.