However due to the low visual quality of video, most higher budget series were shot on film at 24fps and converted via 3:2 pulldown to match the 60Hz.
So TVs have been 60Hz/59.94Hz(NTSC) ever since their inception and an old video camera would shoot 60fps interlaced to match the refresh rate. This question is mainly about pre-2000 TV series created for CRT TVs, but a lot of it still applies for HD-TV content.
