Before Las Vegas developed, Miami's Golden Beach had always been the place that attracted many American tycoons for vacation.
As for Atlantic City...
In fact, at the beginning of its development, the first pioneers of Atlantic City truly wanted to use its natural geographical advantages to turn it into a resort for America's wealthy.
However, at that time, despite Atlantic City's excellent geographical advantages, the environment was not very good. During the summer, the city would be overrun with flies; one might come out of the bathroom wearing a suit of flies, and in addition, the drinking water in Atlantic City was highly inconvenient. This led to wealthy individuals losing interest in the area.
Under such circumstances, Atlantic City could only attract blue-collar workers from Philadelphia and New York.