La Paz (Spanish pronunciation: [la ˈpas], The Peace) is the capital city of the Mexican state of Baja California Sur and an important regional commercial center. The city had a 2010 census population of 215,178 persons, but its metropolitan population is somewhat larger because of surrounding towns like el Centenario, el Zacatal and San Pedro. Its surrounding municipality, which is the fourth-largest municipality in Mexico in geographical size, reported a population of 251,871 persons living on a land area of 20,275 km² (7,828 sq mi).

La Paz was first inhabited by Neolithic hunter-gatherers at least 10,000 years ago who left traces of their existence in the form of rock paintings near the city and throughout the Baja California peninsula. On May 3, 1535, Hernán Cortés arrived in the bay by La Paz and named it Santa Cruz; he attempted to start a colony but abandoned his efforts after several years due to logistical problems. In 1596 Sebastián Vizcaíno arrived, giving the area its modern name, La Paz.

Nuestra Señora de La Paz (Spanish pronunciation: [ˈnwes.tɾa seˈɲoɾa ðe la pas]; English: Our Lady of Peace; Aymara: Chuquiago Marka or Chuqiyapu), simply known as La Paz, is the seat of government of Bolivia, as well as the departmental capital of the La Paz Department, and the second largest city in the country (in population) after Santa Cruz de la Sierra. It is located in the western part of the country in the department of the same name at an elevation of roughly 3,650 m (11,975 ft) (the city is built on steep hills) above sea level, making it the world's highest "de facto" capital city, or administrative capital.

While the official capital of Bolivia is Sucre and it is the seat of Justice, La Paz has more government departments, hence the "de facto" qualifier. The city sits in a "bowl" surrounded by the high mountains of the altiplano.

As it grows, the city of La Paz climbs the hills, resulting in varying elevations from 3,000 to 4,100 m (9,800 to 13,500 ft). Overlooking the city is towering triple-peaked Illimani, which is always snow-covered and can be seen from several spots of the city, including from the neighbor city of El Alto. As of the 2001 census, the city had a population of 877,363.La Paz Metropolitan area, formed by the cities of La Paz, El Alto and Viacha, make the most populous urban area of Bolivia, with a population of 2.3 million inhabitants and surpassing the metropolitan area of Santa Cruz de la Sierra.

Baja California Sur (Spanish pronunciation: [ˈbaxa kaliˈfornja sur]), officially Free and Sovereign State of Baja California Sur (Spanish: Estado Libre y Soberano de Baja California Sur, literally: South Lower California), is the smallest (by population) of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. Before becoming a state on October 8, 1974, the area was known as the South Territory of Baja California. It has an area of 73,475 km² (28,369 sq mi), or 3.57% of the land mass of Mexico and comprises the southern half of the Baja California peninsula, south of the 28th parallel. It is bordered to the north by the state of Baja California, to the west by the Pacific Ocean, and to the east by the Gulf of California, also known as the "Sea of Cortés." Also, the state has maritime borders with Sonora and Sinaloa to the east across the Gulf of California.

As of 2010, the population was 637,026. The state is home to the tourist resorts of Cabo San Lucas and San José del Cabo. Its largest city and capital is La Paz, a tourist resort and historic landmark. It includes Loreto, the historic first capital of all three Californias (Baja California Sur, Baja California, and California), the town of Santa Rosalía which is the site of a historic church designed by Gustave Eiffel. The smoke stack of the silver smelters in El Triunfo, Baja California Sur was designed by Gustave Eiffel. Eiffel never visited Baja California Sur, rather his early architectural works were sold as 'cookie cutter' designs and can be seen in hundreds of locations around the world. Although the silver industry ended full scale production in the 1950s the stack and ruins of the silver industry remain as a significant landmark today.

Baja California (English /ˈbɑːhɑː kælɨˈfɔrnjə/, Spanish: [ˈbaxa kaliˈfornja]), officially Free and Sovereign State of Baja California (Spanish: Estado Libre y Soberano de Baja California, literally: Lower California), is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is both the northernmost and westernmost state of Mexico, but before becoming a state in 1953, the area was known as the North Territory of Baja California. It has an area of 70,113 km² (27,071 sq mi), or 3.57% of the land mass of Mexico and comprises the northern half of the Baja California peninsula, north of the 28th parallel. The state is bordered on the west by the Pacific Ocean, on the east by Sonora, the U.S. State of Arizona, and the Gulf of California (also known as the Sea of Cortez), and on the south by Baja California Sur. Its northern limit is the U.S. state of California.

The state has a population of 2,844,469 (2005 census), and estimated 3,165,776 (June 2009) much more than the sparsely populated Baja California Sur to the south, and similar to San Diego County on its north. Over 75% of the population lives in the capital city, Mexicali, or in Ensenada and Tijuana. Other important cities include San Felipe, Rosarito and Tecate. The population of the state is composed of Mestizos, mostly immigrants from other parts of Mexico, and, as with most northern Mexican states, a large population of Mexicans of European ancestry, and also a large minority group of East Asian, Middle Eastern and indigenous descent. Additionally, there is a large immigrant population from the United States due to its proximity to San Diego and the cheaper cost of living compared to San Diego. There is also a significant population from Central America. Many immigrants moved to Baja California for a better quality of life and the number of higher paying jobs in comparison to the rest of Mexico and Latin America.

California (pronounced ⁱ/kælɨˈfɔrnjə/) is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third most extensive (after Alaska and Texas). It is home to the nation's second- and sixth-largest census statistical areas (Los Angeles Metropolitan Area and San Francisco Bay Area), and eight of the nation's fifty most populated cities (Los Angeles, San Diego, San Jose, San Francisco, Fresno, Sacramento, Long Beach and Oakland). The capital city is Sacramento.

California's diverse geography ranges from the Pacific Coast in the west, to the Sierra Nevada mountains in the east – from the Redwood–Douglas-fir forests of the northwest, to the Mojave Desert areas in the southeast. The center of the state is dominated by Central Valley, a major agricultural area. California contains both the highest and lowest points in the contiguous United States (Mount Whitney and Death Valley), and has the third-longest coastline of all states (after Alaska and Florida). Earthquakes are a common occurrence due to the state's location along the Pacific Ring of Fire: about 37,000 are recorded annually.