The biggest difference between the US and somewhere like Germany is the price of land. While land can be expensive in certain highly desireable places, it is possible to buy habitable land in the US for what is a derisory amount of money to a European - often less than $1,000 per acre. This drives the cost of home ownership down to levels that can be aspired to by many people. There is a lot of homebuilding as a result, which also keeps costs low.
In comparison, buildable land in a European village or small town can be $100,000/acre - not that you can find an acre to buy anyway. Even if you could afford the land, you would then have to find the same amount again to build the house - so it is much cheaper to rent.
It captures some of the US pro-home-ownership arguments lower in the article.
Yeah, there are places in Europe cheaper than Germany, but $700,000/acre does not surprise me. I should have added that construction standards are very different between Europe and the US which also accounts for the low cost of housing. In many (most?) parts of the US houses are made of simple timber frames and hence are simply and quickly erected - I have seen houses (the outer shell obviously) go up in as little as two days. In Europe a lot (most?) of housing is made of brick, a more laborious process.
Think you'd have to look at the term "buildable"... the US doesn't try very hard to prevent urban sprawl with it zoning rules. The EU, in comparison, may restrict zoning and in particular restrict the conversion of agricultural land into housing tracts.
An acre is ridiculously large for building a house on. 1/10th of an acre is what an average Belgian free-standing house is build on these days, in the Netherlands it's even smaller.
I'd jump at any chance to buy an acre of land zoned for residential construction for only 100k, even in the most 'rural' areas here ('rural' being relative, even very rural here is still suburban by US standards).