Ducoudray Holstein Expedition
The Ducoudray Holstein Expedition was an attempt by commercial interests to invade Puerto Rico, and declare it the independent "Republica Boricua" in 1822. In the 1820s there was a plot to invade Puerto Rico, declare its independence from Spain, proclaim the Republica Boricua and establish its capital in Mayagüez.
Source: Wikipedia — Ducoudray Holstein Expedition (CC BY-SA 4.0)