Question

which cities are an example of urban sprawl so extreme that the cities merged together? washington dc and san diego new york and dallas minneapolis and st. paul

Explanation:

Urban sprawl leading to merged cities refers to adjacent urban areas that have grown together into a single metropolitan region. Minneapolis and St. Paul are adjacent cities in Minnesota, US, that have experienced extensive urban sprawl, merging into a combined metropolitan area commonly called the Twin Cities. The other pairs of cities are geographically distant and have not merged due to sprawl.

Answer:

Minneapolis and St. Paul