The US is a much richer country than the UK. Wages are higher and thus the market can bear higher prices. For example experienced nurses in the US can make six figures whereas in the UK nurses start on a poverty salary and through experience can upgrade that to mid five figures.
Moreover the UK has undergone dollar deflation in recent years that we are only just catching up to. The pound dropped from $1.70 to $1.20 in the last decade. But £ inflation over that period was low. So prices were in fact falling in dollar terms until the recent inflationary period.
Moreover the UK has undergone dollar deflation in recent years that we are only just catching up to. The pound dropped from $1.70 to $1.20 in the last decade. But £ inflation over that period was low. So prices were in fact falling in dollar terms until the recent inflationary period.