In the text “Regional Diversity” by Mark Baldassare I learned that California’s unique distinctions and tensions are intensified by the state's unique geography. This is because of the state's distant southern and northern borders , coast and internal boundaries and history. This is significant because residents of California don't view California in its oneness. Thus, the four main regions of California are essential to understand California as a whole. The four regions of California are L.A, San Francisco Bay Area, the Central Valley, Orange County and Inland Empire. They are all distinct in populations, growth, economy, geography, politics and public concerns. However, over 80 percent of Californians live in one of the four regions. All four regions have unique political, social, and economic profiles as well as substantial experience with immigration and racial issues. They are all important to understand because they make up California and play an essential role in elections and formation of public policy.