Geography & population density play some role. The landmass of the US is 70x larger than the UK, which is about the size of Alabama, but the US has only 5x more

Geography & population density play some role. The landmass of the US is 70x larger than the UK, which is about the size of Alabama, but the US has only 5x more population. I don't think that totally explains the 5x price difference but it's worth considering.