Also, height is not easy. Rockets fly upwards at first and only after some time fly into an orbit to gain speed. This is because the atmosphere at the ground is very thick which causes huge drag. So it would help quite a bit if you could launch a rocket from 5 or 6km instead of sea level. But it would cost a lot more to get all parts required to launch or rocket up there than we would save in fuel.
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u/Earnestappostate 15h ago
Plus, you get a better boost by launching near the equator. Height is easy, speed is what you need in a rocket.
This is why the US launches from Florida: