Deletion of Mexico City (former)

Comment: I was about to close this as keep, when I read some of the arguments. Dunadan makes good points. Debate's argument involving the governing structures, politicians, regulations and laws, awards, etc. doesn't convince me, as all the information could be incorporated into the main article. This also isn't comparable to the US Congress example, as the Congress of the Confederation was an entirely separate entity from the modern Congress. If the main article became too long, then |summary style could be used, and "subarticles" like this could be used about the political history, but the Mexico City article certainly isn't all that long, and already incorporates all this information, and could incorporate quite a bit more
Stance: delete
Cited policy: Wikipedia:Summary style (WP:SS)