Answer: Most cultures with writing systems leave written records that archaeologists consult and study. Some of the most valuable written records are everyday items, such as shopping lists and tax forms. Latin, the language of ancient Rome, helps archaeologists understand artifacts and features discovered in parts of the Roman Empire.
The Indus Valley Civilization was found to be declined around 1800 BCE. Many archaeological resources suggest that main reason for the decline was the invasion of Aryans a group of Indo-European tribe.
Explanation: I'm not so sure this will help you
but i hope it does