There is in fact no generally agreed uppon definition of a city. Most people would call Boston a city, but it only has 675k people. Most people wouldn’t call Wells a city, but the British do. Most people would call London a city, but not the British. Generally, a city is a defined area with more density than surrounding areas over 100,000 people, and a significant other factor, be it cultural, administrative, or historical.
On your second point, the US has nine cities over the 1 million mark according to the 2020 census. New York, Los Angeles, Chicago, Houston, Phoenix, San Diego, and Dallas. Boston is number 25 with 675k. Omaha is number 40.
There is in fact no generally agreed uppon definition of a city. Most people would call Boston a city, but it only has 675k people. Most people wouldn’t call Wells a city, but the British do. Most people would call London a city, but not the British. Generally, a city is a defined area with more density than surrounding areas over 100,000 people, and a significant other factor, be it cultural, administrative, or historical.
On your second point, the US has nine cities over the 1 million mark according to the 2020 census. New York, Los Angeles, Chicago, Houston, Phoenix, San Diego, and Dallas. Boston is number 25 with 675k. Omaha is number 40.