at 1939 world's fair, RCA demonstrated 1st commercial TV
it also filmed the opening of the fair by roosevelt, who became the first president on television, although the audience was only in the RCA demonstration area
after WW2, government gave media businesses tax breaks to develop and sell tv sets
federal communications commission regulated TV & radio
it deliberately allowed unlicensed development in the years 1948 - 50
so, just like radio, TV developed on a local level 1st; 3 of the major TV companies were radio companies as well