Its to help you understand what all the symbols mean. Youre looking at a city that has a symbol by it, and you dont know what it means so you look at the map key and it tells you.
Because if it was written after the time of the event, the source may be inaccurate. Also, if it was written in a different place to the event the source is taking about, that place could be particularly biased for or against that event.
Answer:
England
Explanation:
William Shakespeare was an English poet, playwright, and actor, widely regarded as the greatest writer in the English language and the world's greatest dramatist. He is often called England's national poet and the "Bard of Avon"
google