I willl mark brainlies
What resulted from the use of guerilla warfare by North Vietnamese troops?

Many South Vietnamese troops defected and joined the North.
Many South Vietnamese civilians assisted the communist forces.
Heavy machinery like tanks favored by US troops were rendered ineffective.
US troops were able to easily identify Viet Cong forces hiding among civilians.

I could be wrong, I think the best answer will be is Many South Vienamese civilians assisted the communist forces. Good Luck!

US troops were able to easily identify Viet Cong forces hiding among civilians.

Explanation:

answer; the best answer is (demand);

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.