Pinckney's Treaty with Spain is considered a diplomatic highlight of Washington's administration because it: ceded (gave) Florida to Spain. withdrew Spain's military forces from the Caribbean. opened Spanish Caribbean ports to US trade. allowed the US to use the port of New Orleans.

Allowed the United States to use the port of New Orleans.

Explanation:

The Pinckney's Treaty, signed in October 1795, allowed the United States to navigate in the Mississippi River, also allowing America to use the ports of said river, especially that of New Orleans, in order to be able to trade with the Caribbean nations. In addition, it specifically delimited the border of Florida, at that time belonging to Spain, and Georgia, which currently remains the border between the two states. Finally, through this treaty the friendship between both nations was formalized, and Spain promised not to ally itself with the native nations that were besieging the United States at that time.

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d)to gain support for the independence movement.

hope this : )