Kasumne

Kasumne belongs to the Plains Miwok country along the Cosumnes River, where acorns and salmon sustained settlements linked to the delta waterways. The river and its marshes supported food gathering, fishing and movement between neighbouring communities. In October 1808 Gabriel Moraga's mounted expedition reached the Cosumnes before continuing north to the American and Feather rivers.

Mission expansion increasingly drew people out of this inland country. San José's baptismal records identify forty-one Cosomnes from the Wilton region among new converts in the last three months of 1834. Further baptisms continued even as the Mexican government began secularising the missions. San José ceased to be a landholding institution in November 1836. During 1837, Plains Miwok people there faced the choice of returning to their Sacramento Valley homelands or remaining as workers on the ranches replacing mission estates.