The city of Los Angeles began to expand rapidly around the time of the First World War. Its population steadily increased during World War II, and then spread out in the 1970s. The success of Los Angeles had put a strain on its natural resources in the early 20th century, particularly its need for water, which was solved with the construction of an aqueduct. By 1943, the population of Los Angeles County was greater than that of 37 states and was home to one in 40 U.
S. citizens.In 1899, Isaias W. Hellman purchased five streetcar lines, consolidating them into the Los Angeles Railroad (the “yellow cars”) and two years later founded the Pacific Electric Railway (the “red cars”). Between 1899 and 1903, Harrison Gray Otis and his successor son-in-law, Harry Chandler, successfully bought up cheap land on the northern outskirts of Los Angeles, in the San Fernando Valley.
When the United States took control of California after the Mexican-American War, Los Angeles was still quite neglected.During heavy storms, the volume of water in the Los Angeles River in Long Beach can be as large as that of the Mississippi River in St. Louis. In order to connect Los Angeles with all the new cities and countries that surrounded it, the Pacific Electric (PE) railway line was built as public transportation. Los Angeles, now the second largest city in the United States and a major economic power on the West Coast, was originally inhabited by indigenous tribes such as the Chumash and Tongva hunter-gatherers around 8000 B.
C.D. W. Griffith was one of the first directors to film in the Los Angeles area, attracted by its mild climate and low salaries for non-union workers. William Mulholland and J.
B. Lippencott conducted studies on water in the Owens Valley for the Service while secretly receiving a salary from the city of Los Angeles.Although Los Angeles County never experienced bombardments or enemy invasions, it became an integral part of the United States Theater on the night of February 24 to 25, 1942 during what is known as The Great Los Angeles Air Raid or The Battle of Los Angeles. This took place one day after a Japanese naval bombing of Ellwood in Santa Barbara, California, 80 miles from Los Angeles.In 1820, El Camino Viejo route was established from Los Angeles, crossing over mountains to the north and up through San Joaquín Valley to San Francisco Bay. In December 1777, Viceroy Antonio María de Bucareli y Ursua and Commander General Teodoro de Croix approved a civic municipality in Los Angeles and a new prison or garrison in Santa Barbara.During World War II, nearly 100,000 workers were employed in shipbuilding and combat aircraft manufacturing around the port of Los Angeles.