The Aboriginal Population of Alameda and Contra Costa Counties, California

In Short

This academic monograph presents a meticulous investigation into the pre-colonial indigenous population of Alameda and Contra Costa counties. By synthesizing the diaries of early explorers like Juan Crespi and Juan Bautista de Anza with mission baptismal records, the author estimates the size and distribution of native settlements along the East Bay. It functions as a demographic ledger, translating fragmented historical observations into a structured analysis of a society that was rapidly altered by the arrival of Spanish missions and soldiers.

The Story

The narrative begins with the initial Spanish contact in the late 18th century, focusing on the expeditions of Fages, Crespi, and Anza. These explorers traveled through a landscape where the indigenous population was primarily concentrated along the Bay shore, specifically near the large arroyos and coastal inlets. The author highlights a striking absence of permanent settlements in the current areas of Oakland and Berkeley, noting instead that the population clustered where resources like firewood and fresh water were readily available.

As the account progresses, the focus shifts to the inevitable friction between the Spanish and the local tribes. The author details various military and punitive expeditions—such as the "Cuevas Affair" and the movements of soldiers like Pedro Amador—which reveal a pattern of forced conversions and conflict. These records show that the indigenous inhabitants, often described as "Sacalanes" or "Cuchillones," did not passively accept the intrusion. There were repeated skirmishes, armed resistance, and a documented flight of native groups into the interior ranges to escape the orbit of the missions.

The story concludes with an analytical synthesis of baptismal registers from the missions of San Francisco, Santa Clara, and San Jose. By mapping these records to specific regions—such as the redwoods behind Oakland or the valleys near Livermore—the author bridges the gap between explorers' initial counts and the later colonial data. The final section serves as a demographic reconciliation, where the author compares the early estimates of approximately 2,400 people with later baptismal patterns. The result is a cold, calculated portrait of a population undergoing a rapid, state-sponsored contraction. The author avoids romanticizing this transition, choosing instead to present the archival evidence of a world being dismantled, village by village, as the mission system expanded its reach into the interior hills.

How It Unfolds

The initial survey The author begins by analyzing the early diaries of explorers like Crespi, who noted thirteen villages between Milpitas and Crockett. These primary documents provide the first crude, though valuable, quantitative snapshot of the region's human geography.

The Anza expedition The text moves to the 1776 expedition, which provided more granular data on village sizes and native behaviors. The explorers observed a people who were not only skilled in fishing but were also wary of the newcomers, often abandoning their homes before the soldiers could arrive.

Military escalation The narrative shifts to the late 1790s, when the focus moved from exploration to the retrieval of fugitive Christians. These punitive trips into the interior to recover those who fled the missions highlight the violent nature of the colonial encounter.

The mission records The final movement examines the baptismal data, which the author uses to verify the earlier estimates. By categorizing converts by geographic origin, the author identifies the specific tribal clusters that were gradually absorbed by the mission system.

The People

The text is defined more by groups and administrative entities than by individual protagonists, yet several figures anchor the historical evidence. Fray Juan Crespi serves as the initial observer; his diaries provide the foundational census numbers that the author later tests against other sources. Juan Bautista de Anza provides a more rigorous, second-look account that adds depth to the descriptions of native settlements at places like Tormey. Sergeant Pedro Amador emerges as the primary enforcer of Spanish colonial policy, leading multiple punitive expeditions that illustrate the military pressure placed on local tribes. The indigenous people appear mostly as anonymous groups, identified by tribal names like the Sacalanes and Cuchillones, whose organized resistance and eventual flight into the interior define the tragedy of the period. The missionaries, such as Fray Antonio Danti, act as the administrative architects of the social change, recording the names and origins of those they sought to convert, inadvertently preserving the identity of the people they were displacing.

In Its Own Voice

"As soon as we halted thirty-eight Indians came to us unarmed, peaceful, and very happy to see us."

Describing the initial, tentative meeting between the Anza expedition and local indigenous people at Rodeo Creek.

"Some of them came to see us, carrying bows and arrows, for all had very good ones and well made, the bow of good wood, small and wound with tendons."

Observing the defensive readiness of the local inhabitants during the Anza expedition’s march through Walnut Creek.

"The Indians fugitive from the Mission of San Francisco, Sacalanes and Cuchillones, are being recovered by means of emissaries and parties of soldiers who are treating them with the greatest gentleness and humanity."

Quoting a 1799 letter from Governor Borica to the Viceroy, which masks the underlying violence of the forced return of indigenous people to the mission.

What It's Really About

The central argument is that the indigenous population of the East Bay was not a static, primitive group, but a complex, localized society tied to specific ecological niches along the Bay shore. The author contends that by triangulating fragmented expedition diaries with mission registers, one can construct a reliable, if incomplete, census. Underneath this demographic work lies a deeper question about the invisibility of these groups: why certain areas were heavily settled while others were avoided, and how the mission system functioned as a mechanism for both religious conversion and territorial erasure. It is a study of how historical records are used to measure the loss of a culture.

Why Read It Today

This book is essential for those interested in the rigorous, data-driven side of ethnohistory. It does not offer a narrative of individual heroism, but rather the stark reality of how colonial power systematically mapped and absorbed a indigenous population. Readers who appreciate the meticulous assembly of evidence—diaries, military reports, and baptismal lists—will find the author’s detective-like approach deeply satisfying.

However, the reader should be prepared for the specialized nature of the work. It is not a popular history; it is a scholarly account filled with geographic technicalities, lists of historical records, and the dry, detached tone of mid-20th-century anthropology. The author’s period-typical reliance on Spanish colonial documents means that the voices of the indigenous people are rarely heard directly, appearing only through the lens of those who were actively documenting their disappearance. It is a quiet, somber book that stays with you by forcing a confrontation with the sheer volume of "lost" history buried in archives. For anyone seeking to understand the foundational displacement that shaped the modern California landscape, the author provides the cold, hard facts of the record.