[someone123]

Yes, and in general it's built very differently. Halifax is more densely built on average than most of the large US metros (e.g. Boston, Philadelphia, LA). The average of course does not tell the full story since those larger cities have dense sub-areas but when it comes to the smaller cities in the US with around a million people it's not hard to imagine there being equivalent or larger parts of Halifax that are well-suited to transit. Something else to consider is that many substantial metros in the US are not real cities, but rather agglomerations of towns and sprawl.

Given the way construction is going I would also imagine that the size and population of areas that could support rapid transit in Halifax are growing relatively quickly. Most new construction in the city is multi-unit, with the majority of those being mid-sized concrete condos and apartments of 4-12 floors.

The big problem I think is not overall demand but rather the fact that it's hard to serve large parts of the city with a simpler system.