California has a diverse landscape and climate due to its formation between shifting tectonic plates. It was home to many native tribes before European colonization. The economy grew to include agriculture, industry, entertainment, tourism, and services. Labor unions organized workers in the late 19th century to demand better treatment and wages. Strikes were common during times of economic hardship, such as the Great Depression. The 20th century saw California emerge as a cultural center, particularly in film, art, literature, music, and architecture. Industries in entertainment and technology continue to drive California's prominent place in American culture and innovation.