After experimentation that began in St. Louis in the late 1920s, the market was readying itself for the television age in the early 1940s, but U.S. involvement in World War II brought all such technological development to a standstill.
As soon as the war ended, The Pulitzer Company resumed its efforts to procure a license for a television station and was able to put KSD-TV on the air in 1947. Those companies wishing to follow quickly were stymied when the Federal Communications Commission, citing a huge backlog of applicants, instituted what would become a four-year "hold" on all new stations, thus granting KSD-TV a virtual market monopoly in its early years.
Many companies tried to put television stations on the air locally. Not everyone succeeded. This site shows the history of those efforts.