Answer to Question 1
Legal positivism simply means: The law is what the sovereign says it is. The sovereign is the recognized political power whom citizens obey, so, in the United States, both the state and federal governments are sovereign. Therefore, whatever the sovereign declares to be the law is the law, regardless of whether it is right or wrong.
Natural law stems from the belief that the law must have a moral basis. Therefore, an unjust law is no law at all and need not be obeyed.
Legal realism says that it does not matter what is written as law; what counts is who enforces that law and by what process. Personal characteristics and biases influence this determination.
Answer to Question 2
TRUE