William Alexander Leidesdorff was born in 1810 on St. Croix in the Danish West Indies. He later migrated to the United States, and although the details of his early life are not fully certain, he succeeded in the import trade and built a tidy fortune before moving west.
He arrived in San Francisco, then the small Mexican-ruled settlement of Yerba Buena, in the early 1840s and became one of its leading citizens. He launched a general store, built ships and ran the city's first hotel, and his ventures put him at the centre of the little port's commercial life.
In 1845 President James Polk named him American Vice Consul to the Mexican outpost in California, making him the first Black American diplomat. His position, his businesses and his command of languages and trade made him an influential figure as California moved from Mexican to American rule.
Leidesdorff owned the first steamship to sail on San Francisco Bay and established several notable firsts for the city, including its first public school building, its first hotel and a waterfront warehouse. He became a millionaire when gold was discovered on land he owned, and is widely described as America's first Black millionaire.
He died in 1848, aged about 38, just as the Gold Rush transformed the city he had helped to build. A street in San Francisco's financial district still bears his name, and he is remembered as one of the founders of the city.
- First Black American diplomat, appointed vice consul in 1845
- Owned the first steamship on San Francisco Bay
- Established San Francisco's first public school building, hotel and waterfront warehouse
- Widely described as America's first Black millionaire
- One of the founders of San Francisco
- Be early to an emerging place. Leidesdorff arrived in San Francisco before the Gold Rush and helped build the infrastructure that others later relied on.
- Business and public service can reinforce each other. His commercial standing earned him a diplomatic post, and the post increased his influence.