Which of the following set up a formula to determine the number of immigrants allowed into the united states?

a. twenty-first amendment

b. national origins act

c. eighteenth amendment

d. emergency quota act

they required less loading and unloading

explanation:

the shipping container improved shipping because it cut down on unloading time by three weeks, eliminated wasted space, and allowed ships to carry.

c. archbishop desmond tutu promoted the acknowledgement of the rights of black africans and expose human rights abuses.

d. leader haile selassie modernized african society through the institution of progressive social, economic, and educational reforms.