Short answers, pulled from the story.
Los Angeles was founded on the 4th of September 1781 when forty-four settlers established El Pueblo de Nuestra Señora la Reina de los Ángeles del Río Porciúncula. This settlement rose from the village of Yaanga which held deep meaning for the indigenous Tongva people who had inhabited the region for centuries before Spanish arrival.
Los Angeles incorporated as a municipality on the 4th of April 1850 five months before California achieved statehood. The pueblo became part of the First Mexican Empire in 1821 following the Mexican War of Independence before American Conquest culminated with the signing of the Treaty of Cahuenga on the 13th of January 1847.
The 2020 U.S. census reported population reaching three million eight hundred ninety-eight thousand seven hundred forty-seven residents. Population density measured eight thousand three hundred four point two people per square mile or thirty-one hundred sixty-eight per kilometer.
Mount Lukens reaches highest elevation within city proper located in San Gabriel Mountains foothills at north extent of Crescenta Valley. The Los Angeles River flows seasonally straightened and lined six hundred miles of concrete by Army Corps Engineers for flood control purposes.
Hollywood merged into Los Angeles in 1910 when ten movie companies already operated within the city limits. By 1921 more than eighty percent of the world film industry concentrated in Los Angeles with major studios like Paramount Pictures transforming the region into the world capital of film production during the early twentieth century.