Dragon Pass and Prax especially have a Western feel to them. With the ducks and all, we could fix Dragon Pass as California and Prax as the surrounding desert. Dragon Pass belongs to the Dragons, who represent Zen. The Orlanthi are settlers and the Lunars are invaders.
Holy Country, where the Orlanthi come from, should be New Orleans. The golddiggers who settled California belong to that strain. It's a slave-owning feudal society, basically Catholic. The Pharaoh is the Pope.
Peloria should be New England. Yelm worshippers are Puritans, so Protestants. Lunarism is what you have in Hollywood. Tarsh is Los Angeles.
There's a dialectic between old and new. Eventually the dragons eat everyone up.
Such an interesting conversation I have to jump in. I never played in Glorantha but did own the Finnish translation of the 3rd edition as a child. The rules were too hard so we played other games, especially Warhammer Fantasy Roleplay that was much influenced by RuneQuest and Call of Cthulhu.
Recently I bought the scans of Wyrm's Footnotes, which are most fascinating. The layout and feel have much in common with the Principia Discordia, another product of that time and place.