Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
An alcaldía mayor was a civil division of the government of New Spain until 1786 when the intendencia system was introduced. In 1786 there were 129 of these subdivisions.
Sources
Gerhard, Peter. A Guide to the Historical Geography of New Spain. Cambridge: Cambridge University Press, 1972.
