Why do we know so little about the indus valley civilization? what evidence do we have that the indus valley people were an advanced civilization?

we no so little about the civiliazation because they were lost for many many years and evidence we have is that they had sewer systems and bathrooms they also had there building evenly apart

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.