How did San Francisco come to be a hub of retail and commerce? It's in our history.

Sources:
Frank Soulé, John H. Gihon, James Nisbet, "The Annals of San Francisco", 1855
Robert O'Brien, "This is San Francisco - A Classic Portrait of the City", 1948
Louis J. Stellman, "Port O'Gold", 1922
William Martin Camp, "San Francisco Port of Gold", 1947
Stewart Edward White, "Old California in Picture and Story", 1939