I think box-springs are much more popular in the US. My bed in the US had about the same clearance underneath, but was a bit taller than my bed in Norway because over here the mattress is built into the frame and just has a topper on it, whereas in the US there was a frame, box-spring, mattress, and mattress-topper. As for why box-springs are more popular in the US, I have no idea.
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I think box-springs are much more popular in the US. My bed in the US had about the same clearance underneath, but was a bit taller than my bed in Norway because over here the mattress is built into the frame and just has a topper on it, whereas in the US there was a frame, box-spring, mattress, and mattress-topper. As for why box-springs are more popular in the US, I have no idea.