Why do historians study cause-and-effect??

It is absolutely vital for historians to understand the cause and effect relationship between events in history because this helps to explain why the events happened in the first place

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.

1) she is extremely upset