There is a difference between invasion and migration though, AIT has long been debunked, the current consensus is AMT
replyThere are many historical events of Indo-European speakers invading India from the north, like Darius the Great, Alexander the Great, the Mughals. AIT refers to a theory from an earlier time period but rejecting it does not rule out subsequent Indo-European conquests of the region which surely contributed to the spread of Indo-European culture and language southward.
replyThat doesn't explain Sri Lanka which is past South India...
replyEdit: The actual answer is North/Eastern Indians speaking an IE variant immigrated to Sri Lanka in the 5th/6th centuries and became the dominant language there since (Sinhala)
Could it be that Sri lanka is an island
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