A few I can think of with POD
Montreal - if no Eerie Canal is built the St. Lawrence would remain the easiest way to access the Great Lakes. This is a huge blow for New York (and probably the US if it exists in TTL).
New Orleans - France keeps Louisiana or a chunk of it; it becomes a major access point to the interior of America.
Mexico City - anything with Mexico being better developed (ironically this Mexico City might be smaller than OTL's in terms of population).
San Diego - an alternate to Los Angeles / Long Beach if the US gains more Mexican territory.
San Francisco - probably best option would be for the US not to gain Southern California, then it becomes its main access to the Pacific, as it was in OTL.
Rivas- A Nicaraguan Canal is built, early on.
Havana - No commie revolution, Cuba grows economically, in banking, and tourism. Havana remains the Jewel of the Caribbean.
Rio de Janerio or Sao Paolo - Brazil doesn't get involve in the War of Triple Alliance, it remains stable and continues the path it was headed.
Vienna & Berlin - they were headed that way in OTL. No WWI is a good divergence.
Constantinople/Istambul - It was a world class city, and it is not hard to have kept it that way.
St. Petersburg - Keep Russia strong.
There are quite a few others in Europe that depending how far back you go could likely become world class cities some have been mentioned.
Algiers / Tripoli / Alexandria - could have become quite cosmo/metro-politan had there been gradual decolonization.
I like the idea of Zanzibar City as an African HK/Singapore, not so sure how you get there.
Had a few Indian costal cities stayed as city states post-independence, they could have become HK type cities.
Montreal - if no Eerie Canal is built the St. Lawrence would remain the easiest way to access the Great Lakes. This is a huge blow for New York (and probably the US if it exists in TTL).
New Orleans - France keeps Louisiana or a chunk of it; it becomes a major access point to the interior of America.
Mexico City - anything with Mexico being better developed (ironically this Mexico City might be smaller than OTL's in terms of population).
San Diego - an alternate to Los Angeles / Long Beach if the US gains more Mexican territory.
San Francisco - probably best option would be for the US not to gain Southern California, then it becomes its main access to the Pacific, as it was in OTL.
Rivas- A Nicaraguan Canal is built, early on.
Havana - No commie revolution, Cuba grows economically, in banking, and tourism. Havana remains the Jewel of the Caribbean.
Rio de Janerio or Sao Paolo - Brazil doesn't get involve in the War of Triple Alliance, it remains stable and continues the path it was headed.
Vienna & Berlin - they were headed that way in OTL. No WWI is a good divergence.
Constantinople/Istambul - It was a world class city, and it is not hard to have kept it that way.
St. Petersburg - Keep Russia strong.
There are quite a few others in Europe that depending how far back you go could likely become world class cities some have been mentioned.
Algiers / Tripoli / Alexandria - could have become quite cosmo/metro-politan had there been gradual decolonization.
I like the idea of Zanzibar City as an African HK/Singapore, not so sure how you get there.
Had a few Indian costal cities stayed as city states post-independence, they could have become HK type cities.