It is both a city and a county within the US State of Pennsylvania.
A city state within a city is Vatican City which is located withing the city of Rome, Italy. Rome is a landlocked city.
Within Rome is the city state of the Vatican. It is the smallest city state in the world with 300 residents living within its borders including the Pope.
The Vatican City is its own nation, sovereign from Italy and other nations. Its official name is the Holy See and it has status within the United Nations as an Observer State.
No. It is a city within the state of Guerrero. The capital of such state is the city of Chilpancingo.
No, a city cannot become a state on its own. States are considered sovereign entities within a country, with their own government and laws. Cities exist within states and are governed by state and local governments.
No. It is the name of a federal state and its capital city within Mexico - yes, Mexico is a federal republic.
Vatican
No. New York City is a city within the State of New York stated as New York, N.Y. New York State is a state within the United States of America. The USA is a developed country. See related link.
No, Milwaukee is the largest city. The capital of Wisconsin is Madison.
There are 2: Oklahoma City, Oklahoma. Indianapolis, Indiana
Indianapolis is the capital of the state of Indiana. Slightly less discreet is Oklahoma's capital of Oklahoma City. Both have the full name of the state spelled within the name of the capital.