The US government signed two treaties with Pomos in 1851 -- 1852 which defined Pomo territory ; however , these treaties were never ratified by congress .
In the 19th century , European - Americans rapidly flooded Pomo lands .
The US government signed two treaties with Pomo in 1851 -- 1852 which defined Pomo territory ; however , these treaties were never ratified by congress .
In the 19th century , European - Americans rapidly flooded Pomo lands .