the Enlightment
the Aztecs conqured much of central Mexico
Your question is too broad. During which time period? Mexico has had a military since it became an independent nation, more than 200 years ago.
200 years ago
Until about 200 years ago people thought that sponges were aquatic plants.
200 years ago
12,000 years ago from today (2012), would be the year of 9,988 BCE.
In 2017 it is 200 years ago.
No one 2009 it was 200 years ago. 1809 Wars vs Finland.
Subtract 200 from 2013 and you have the answer.
About 200 million years ago.
Pangea began to drift apart about 200 million years ago. Pangea split into two smaller continents: Gondwana and Laurasia. These continents lasted from about 200 million years ago to 100 million years ago.
The 2nd century AD was about 1800 years ago. This refers to the period between there years 100 and 200 AD.