Every year something happened, which is most of them.
1872 — Charles Crocker's Railroad Bridge Proposal
1916 — James Wilkins' Newspaper Campaign
1917 — Joseph Strauss Appointed Chief Engineer
1921 — The $27 Million Feasibility Study
1924 — War Department Approval
1928 — Bridge and Highway District Formed
1929 — The Bond Campaign During the Crash
1930 — Voters Approve $35 Million in Bonds
1933 — Groundbreaking Ceremony
1933 — South Tower Foundation Begins
1936 — Main Cable Spinning Complete
1937 — Pedestrian Day: May 27, 1937
1937 — Open to Vehicles: May 28, 1937