The Bloody Island Massacre occurred in the context of violent conflict between indigenous Californians and American settlers during the period of westward expansion. A number of Pomo people had been enslaved by two settlers, Andrew Kelsey and Charles Stone, and confined to one village where they were starved and abused. After enduring these brutal conditions, the enslaved Pomo rebelled and murdered their captors, prompting a military response.
In response to the deaths of Kelsey and Stone, the U.S. Cavalry launched an attack on the Pomo at what was then an island in Clear Lake, California, called Bo-no-po-ti or Badon-napo-ti (Island Village) in the Pomo language. The massacre took place on May 15, 1850, at the north end of Clear Lake in Lake County, California. The U.S. Cavalry killed at least 60 of the local Pomo during this engagement.
The Bloody Island Massacre, also known as the Clear Lake Massacre, became a significant episode within the wider California genocide. A July 1850 report by Major Edwin Allen Sherman claimed far higher casualty figures, contending that approximately four hundred warriors were killed and drowned, with as many more women and children who allegedly drowned after plunging into the lake out of fear, suggesting a total of about eight hundred Native Americans perished. This massacre exemplifies the violent suppression of indigenous resistance and the devastating consequences faced by California's native populations during this period of American expansion.
The early republic period saw the United States move from the weak Articles of Confederation to the federal Constitution ratified in 1788, with the Bill of Rights added in 1791. George Washington served two terms as president (1789–1797), establishing precedents for executive authority, and the federal capital moved permanently to Washington D.C. in 1800. The Louisiana Purchase (1803) doubled the nation's territory for roughly $15 million, opening vast trans-Mississippi lands to American expansion. The War of 1812 against Britain ended inconclusively but produced a surge of American national identity and eliminated most British support for Indigenous resistance east of the Mississippi. The Northwest Indian Wars (1785–1795) and the Creek War (1813–1814) broke Indigenous confederacies that had resisted US expansion. The Missouri Compromise of 1820 temporarily balanced slave and free states as the nation expanded westward, but embedded the contradiction of slavery in every subsequent territorial debate.
At least 60 Pomo killed by U.S. Cavalry; a July 1850 report by Major Edwin Allen Sherman claimed approximately 800 Native Americans total (approximately 400 warriors and approximately 400 women and children) killed and drowned at Clear Lake.
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