The "separate but equal" doctrine was established when the U. S. Supreme Court ruled in the case of .

Plessy v. Ferguson

Explanation:

Plessy v. Ferguson is a legal case in May 18, 1896 in which the U.S. Supreme Court put forward the “separate but equal” that questioned and consequently assessed the constitutionality of racial segregation laws. This case Plessy v. Ferguson assessed the Fourteenth Amendment(1868) equal protection clause that made state laws denying equal protection for black people and white people. It consequently sanctioned all laws that promoted racial segregation by way of unequal treatment of black and white people such as use of separate facilities.

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.

answer; night terrors;