it is the world’s first civilisation dating back to 5000 bc.they used bronze and copper for the first time.they had deep knowledge in architecture,civil enginnering,metals,trade and agriculture.they built the world’s first planned cities(harappa and mohenjadro),they built world’s first drainage system,roads,houses with baked bricks,2 and 3 storey buildings,e.t.c.this civilisation ended in 1500 bc by floods from indus river.

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