Yikes, I can't imagine living in any of these. Here I thought my one-room apartment was small!

Japanese also build many houses in small land .

So the house is 10 feet in width. So what? If you go to Vietnam, most of the buildings are 10 feet in width. Practically every house looks like this. The reason is that domestic homes over 10 feet get some sort of tax. This house is unusual in the United States but not globally.

There is a wedge house in Cincinnati. I have photo of it somewhere lol. The front is as wide as the average door plus a bit more making it no wider than 10' . Then it widens to the back to about 25'

So how could you miss the one in Charleston SC. Its one of the oldest and was made at the wish of a servant who wanted a house as wide as his master's door

These are not buildings, these are parts of larger buildings. Headline is a little misleading (and quite disappointing for this Architect excited by the headline).

go to Amsterdam (Holland) and you will see some that are half that width.
most are from days when being inside city walls meant security even if comfort was compromised.