Detailed Instructions: Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Q: Context: The Spanish conquest of the Aztec Empire (begun February 1519) was one of the most significant events in the Spanish colonization of the Americas.
Question: What year did Spanish conquest of the Aztec Empire start?
A:
february 1519