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.

equal pay act of 1963. the equal pay act, signed in to law by president john f. kennedy on june 10, 1963, was one of the first federal anti-discrimination laws that addressed wage differences based on gender. they felt that this would prevent employers from undercutting future wages for men.

explanation:

hitler's  "rise" can be considered to have ended in march 1933, after the reichstag adopted the enabling act of 1933 in that month. president paul von hindenburg had already appointedhitler  as chancellor on 30 january 1933 after a series of parliamentary elections and associated backroom intrigues.