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Contrary to popular belief, many Americans do take their shoes off upon entering their homes. However, it is not an ingrained part of the culture so much as a personal choice. Because of this, you sometimes get people arguing or complaining when you ask them to remove their shoes upon entering your home. In Japan, everyone takes their shoes off at the door as a matter of course, so it's never something which your guests will feel inconvenienced by.
I'll miss my visitors taking their shoes off without argument or even needing to be asked.