The original klan used terror to keep african americans from voting after the civil war, the rebirth of the klan had a broader aim to

At first, the KKK terrorized African Americans from voting. Eventually they became so extreme that they were apprehended by the law.  The clan came back again after the First World War.  This time apart from Blacks, they also harassed Catholics, Jews and other immigrants who they saw was a threat to their way of life.  Another incarnation of that KKK came about during the Civil Rights Movement as they tried to clamp down on Blacks as well as anyone they don’t accept. 

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.

uhh idk for sure but i think it makes it difficult to pump the oil through the oil rigs