Looks like this has turned into the great Canada debate
I'm trying to think of the cities in the US that just came out of nowhere and if there are any cities capable of that now. The two that come to mind immediately over the last 50 years or so are Phoenix and Las Vegas. I really can't think of any that might happen now but then again, those two just made themselves happen so you never know. San Jose also falls into that category but that is part of the Bay area so it didn't exactly come out of nowhere.
I can think a few mid-sized cities that are perceived positively on the national scale that continue to grow. Charlotte and Austin come to mind immediately. Portland, Raleigh, Salt Lake may fall into that category. If San Diego isn't one, it certainly used to be. I think cost of living detracts a bit from its "luster".
Forbes has a list of the top growing US cities. The ranking clearly includes the metropolitan area surrounding it.
1) Austin
2) Raleigh
3) Phoenix
4) Dallas
5) Salt Lake City
6) Denver
7) Ogden
8) Charlotte
9) Orlando
10) Houston
11) Seattle
12) Atlanta
13) Provo
14) Cape Coral
15) Palm Bay
16) Boise
17) Minneapolis
18) North Port, FL
19) San Jose
20) San Antonio
No surprises in my mind on that list. I don't see any of them as 'World Class' cities at this point although the ones that are closest are Atlanta, Dallas, Houston, Phoenix and Seattle in no particular order. Of those, Dallas and Houston have ... by far ... the largest metropolitan areas with Dallas having about a half a million more people than Houston. At their current growth rate, Dallas and Houston could both potentially pass Chicago on the list of largest metros within the next 25 years. Even then ... I wouldn't consider them global 'world class' cities.
Clearly we need to think in terms of metropolitan areas in the US and how they connect. Notice the 3 areas in Utah on that list ... all relatively close to each other - Salt Lake City - Ogden - Provo. There is Austin-San Antonio. San Francisco - San Jose - Oakland. You can see it happening in North Carolina with Raleigh-Cary, Durham, Greensboro - Winston Salem all experiencing significant growth and all relatively close to each other with Charlotte not that far away. Dallas itself has 1.2 million people ... but combined with Forth Worth, Arlington and 10 other cities right next to each other that have over 100K people, it is enormous. Fort Worth all by itself is the 16th largest city (proper) in the US and grew by 38% between 2000 and 2010. Of the cities (proper) with more than 400K people, only Raleigh and Charlotte grew faster. These areas are stars of the future in the US.
I'd be interested to see a list of cities ranked by perception both nationally and globally. For the young, mobile and educated in the US, which cities are on their radar? Which cities are on the global radar that are not named New York, Los Angeles, Chicago and Miami.
Latin America is investing heavily in Miami right now because it is a safe place to put their money. No city in the US or even the Americas is going to topple New York City off its perch anytime soon. Globally, it is considered an extremely safe place to invest and money continues to pour into the city. Can it continue? Investors seem to think so but it won't be long before the multi-millionaires are priced out of Manhattan. It will remain THE alpha++ world city from the Americas for many decades to come.