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, especially in the film, art, music, and architecture industries, which continue to thrive today.