Not sure what factors they're looking at, but American cities are not, as a general rule, very livable.
Our urban planning regimes have, by and large, tended to the construction of automobile-centric infrastructures. Since land is cheap in the United States, we can build bigger houses; and because our culture values independence, we can create spatially segregated communities.
From the 1960s onward, those factors, combined with others, led to the creation of suburban satellites surrounding traditional urban cores. Oftentimes the suburbs became more affluent than the urban, with wealth migrating and clustering into distinct regions and locales.
Also consider how urban planning regimes and zoning ordinances affect the character and make-up of cities. We have suburbs, strip malls and standalone big-box stores. Since America is averse to mixed-use zoning, there's usually a degree of separation between where people live, where they work and where they shop or eat out.
(these same sorts of ordinances are the cause of pic related: standalone businesses creating oceans of asphalt, with more space dedicated to parking than actual shopping centers)
Consequently, many Americans have to own cars. They cannot walk to school, bicycle to the office or take a bus to another town. They're increasingly detached from their neighbors and lack meaningful social interaction outside of educational and commercial contexts. If you live in a suburb, you may not have a sidewalk; and if you do, there's a not-insignificant chance it ends before ever reaching anywhere noteworthy.
Also consider that many small- to mid-sized American towns and cities are dominated by chain restaurants and chain stores. We don't have pedestrian streets and bicycle-only lanes have only recently begun to be introduced in mayn places.
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