An article in caller, a Corpus Christi Texas paper offers up the story of the adventures of Henry Kinney. While the adventures of William Walker in Nicaragua tend to be covered in Nicaraguan history, I don't remember reading about Kinney before.
He created an empire on the Mosquito Coast of Nicaragua in 1854.
Kinney's followers elected him governor. By his own authority, he could raise armies and establish martial law. He appointed a Cabinet, flew his own Mosquito flag, and established a newspaper called The Central American. Kinney's government last 16 days before he resigned. He still struggled to establish control over the territory he claimed, but he was fiercely opposed by William Walker, who had become a power in Nicaragua.