Because its the largest city in its country or its region
The greatest concentration of public in the US is in Texas.
false there are 7 in total
north america
Europe
Asia
Antarctica
Africa
Australia
and south america
hope this helps and is what your looking for
Rivers are lifelines in many dry regions of Africa. They provide the necessary water for agriculture, household uses, transport, and biodiversity. They fill the wetlands of inland and coastal deltas with fresh water, thereby maintaining the inhabitant’s livelihoods and biodiversity of these dynamic areas