What was the impact of the 1939 Golden Gate International Exposition?

The 1939 Golden Gate International Exposition was a significant event in California history primarily held to celebrate the completion of the Golden Gate Bridge, which had opened to traffic the previous year, and to promote tourism in the region. This event showcased the bridge as an engineering marvel and symbol of innovation, cementing its place as a major landmark not just for California but for the world. The exposition also highlighted the cultural and economic vibrancy of the region, attracting visitors from across the globe and helping to revitalize the local economy during a time when the effects of the Great Depression were still being felt.

The exposition included various pavilions and exhibits that featured advancements in arts, culture, and industry, further emphasizing California's role in shaping modern American life. The celebration of the bridge and the promotion of tourism contributed to a renewed interest in visiting California, thereby supporting its economic recovery.

The other options do not accurately reflect the primary significance of the event. While it did help boost California's economy, it did not directly end the Great Depression, nor did it specifically establish California as a center for technology or relate to agricultural production increases.