If the border with Laos had been closed and North Vietnam had not been able to operate in the country, the communist side would not have been able to stock up on resources, men, ammunition, weapons, food and medicine through the HoChi Minh Trail.
Therefore, the forces of the North that were fighting in South Vietnam would have been out of supply, and their defeat would have been imminent.
Many nations had already abolished slavery.
Let me know if you want to know why.
The correct answer is that yes, they advise on rules and legislation and file briefs with the courts. They lobby with the legislative and the executive powers to change laws or implement new measures, while they file briefs with courts as a part of the judicial branch. A brief is when they write a document giving their opinion as to why a side should win in a case.
Stamp Act
Grenville was the British Prime Minister from 1763-1765 and was most famous for his passage of the Stamp Act.
The Stamp Act was wildly hated by the colonists. The act required a tax on government stamps or seals which were necessary to make documents official. All legal documents and contracts would need this stamp and each were tax with the passage of the Stamp Act. The act was so despised it caused rebellion and had to be repealed.