Oklahoma City, located in central Oklahoma, is the state capital and its largest city. The city was born when land was made available to homesteaders in 1889 and its population jumped to 10,000 in a single day. "OKC" became the state capital in 1910 and saw rapid growth in the 1920s when oil was discovered in the area. The oil industry has dominated the city's economy ever since. Among the inventions originating out of Oklahoma City are the parking meter and the traffic signal.