Pinckney’s Treaty with Spain is considered a diplomatic highlight of Washington’s administration because it

This treaty was a diplomatic milestone because it opened up US access to the port of New Orleans.

Explanation:

The Treaty of Pinckney, also known as the Treaty of Madrid, was created to establish a friendly relationship between Spain and the USA, allowing Americans to respect Spanish boundaries and colonies in North America, in addition to allowing both countries to have Mississippi river navigation rights. The great negotiators of these treaties were Thomas Pinckney and Don Manuel de Godoy, the treaty was a milestone in the world history of diplomacy, mainly because it allowed the USA to have access to the port of new orleans.

the correct statement is letter a.   according to the mandate of heaven, kings were considered godlike beings, so they could do as they .

the mandate of heaven is a chinese political and religious ideology used since ancient times to justify the rule of the king or emperor of china, that has been in place since the zhou until the dynasty system ended. it has been created to justify the zhou as the main power of the region. in order to keep harmony, the ruler has to make what he wants and what people want. he had to make good choices to satisfy the people and then they will be happy and keep you in power.