Answer:
The 13th Amendment, ratified in 1865, formally abolished slavery in the territory of the United States. Through this amendment to the constitutional text, slavery was prohibited, thus protecting the rights of African Americans, who until then were subject to said slave and segregationist regime in the southern states of the country.
Although this amendment did not solve all the problems of black people in the country, it was a milestone in the development of civil rights for this social group, which advanced more quickly in the north of the country, while the southern states they applied segregationist policies after the end of Reconstruction.
Thus, finally, after the enactment of the Civil Rights Act of 1964, African-Americans had access to the same rights as whites in the nation, applying this amendment in its entirety.
This is a Supply and Demand relationship. When a company produces large amounts of an item it's cost is normally decreased due to a larger stock. On the other hand, when supply decreases and the need for the item goes up, the item is more expensive.
