What was a direct result of the San Francisco Earthquake?

The San Francisco Earthquake of 1906 resulted in significant destruction, leading to a reevaluation of the city's infrastructure and safety measures. In the aftermath, one of the most immediate and impactful responses was the development of stricter building codes. The devastation highlighted the vulnerabilities in existing structures, prompting officials and architects to consider how buildings could be designed to better withstand earthquakes. These newly established building codes aimed to improve safety, ensuring that future constructions would be more resilient in the face of seismic activity. This shift was an essential step towards enhancing urban safety and emergency preparedness, showcasing a proactive approach to disaster response and urban planning.

The other options, while they might relate to broader changes within California's economic and social landscape, do not directly correlate as immediate responses to the earthquake itself. Instead, the focus on improving building codes reflects a specific and necessary response to the catastrophic damage and loss of life caused by the quake.