John B. Montgomery
San Francisco, San Francisco, California
Marker Inscription
On this spot the American Flag was first raised in San Francisco by Commander John B. Montgomery of the U.S.S. Portsmouth July 9 1846 Marked by the Daughters of the American Revolution San Francisco Chapters 1924
Erected by Daughters of the American Revolution
The Story
On July 9, 1846, at the height of the Mexican-American War, Commander John B. Montgomery of the U.S.S. Portsmouth came ashore and raised the American flag over the little bay-side settlement of Yerba Buena — soon to be renamed San Francisco. The act signaled the United States' seizure of California from Mexico. In 1924 the Daughters of the American Revolution marked the spot.
Why it matters
This flag-raising was a founding moment for American San Francisco and a milestone in the U.S. conquest of California during the westward expansion of the 1840s.
The story behind this marker
AI contextThe era
In the summer of 1846, the United States and Mexico were at war, and the great prize on the Pacific coast was California — then a far-flung and thinly settled province of Mexico. San Francisco Bay, one of the finest harbors in the world, was the strategic key to the whole region, and both nations understood its value.
The settlement on the bay was still a small place called Yerba Buena, a modest cluster beside the water with little hint of the metropolis to come. This was the era of westward expansion, when the young United States was pushing its reach to the Pacific, driven by a hunger for land and harbors that would soon remake the map of the continent.
Control of California would not be settled by the little town's residents but by the movements of navies and armies far away. When the war reached the bay, it arrived by sea, in the form of a United States warship and the officer who commanded her.
People & events
On July 9, 1846, Commander John B. Montgomery of the U.S.S. Portsmouth came ashore at Yerba Buena and raised the American flag over the settlement. It was a deliberate act of possession — the moment the United States laid formal claim to this corner of the bay in the midst of the war with Mexico.
The raising of the flag was less a battle than a statement, an assertion of authority backed by the guns of a warship in the harbor. In one stroke it signaled that the little town on the bay had passed, at least in the eyes of the United States, from Mexican to American hands.
Nearly eight decades later, in 1924, the Daughters of the American Revolution marked this spot to remember the event. Their monument fixes in place a moment that might otherwise have blurred into the fast-changing city — a reminder of the precise day the flag first flew here.
Its place in the American story
This flag-raising was a founding moment for American San Francisco. The town of Yerba Buena would soon be renamed San Francisco, and within a few short years the discovery of gold in California would transform it from a bayside village into one of the great cities of the American West.
The event also marks a milestone in the United States' acquisition of California and the wider Southwest during the Mexican-American War — one of the largest expansions of national territory in the country's history. What happened on this shore was a small, local scene in a continental drama.
That the Daughters of the American Revolution chose to mark it in 1924 shows how a rising city sought to remember its own beginnings. As San Francisco grew, moments like this became the founding stories a place tells about itself — the day the flag went up, and everything that followed.
If you visit
You are in the dense, built-up heart of modern San Francisco, and part of the marker's power is the contrast: it takes some imagination to see the small bayside settlement that once stood where the city now rises around you. The shoreline itself has shifted over the years as the city grew.
Look for the monument amid the surrounding streets and picture a warship anchored offshore and a flag going up over a modest cluster of buildings. From that quiet moment grew everything around you — a useful thing to hold in mind as you take in the scale of the present-day city.
As a stop on a walk through San Francisco's oldest quarter, this spot rewards a pause. It ties the towering, restless city back to a single summer day in 1846, and lets you stand at the place where American San Francisco can be said to have begun.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
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Related people
- · John B. Montgomery
Related events
- · Raising of the U.S. flag at San Francisco, 1846
Themes & tags
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