New evidence about the Indus Valley civilization

Why did a civilization this large seem uninteresting? That is the contrast to notice in the opening. The Indus Valley civilization occupied a huge area and included about 1,400 settlements, yet archaeologists had dismissed it because its architecture looked ordinary and it lacked impressive palaces or citadels. Recent excavations are changing that assessment. We should now expect the writer to explain what makes it distinctive.

The next paragraph gives us cities worth paying attention to. Their builders used flood-proof terraces, long straight streets arranged in grids, and masonry sewers. The achievement lies in how the cities worked, not in a ruler's magnificent palace. That helps us see why judging the civilization by its lack of grand buildings could miss something important.

The housing also supplies evidence about society. There are few signs of class differences and no signs of dominant rulers. The writer takes that as a suggestion of government that was at least partly democratic. Then comes the claim that the civilization apparently flourished without armies, supported by the lack of evidence of weapon production.

Keep those qualifications. Not finding a weapon doesn't prove that no weapon ever existed; evidence can disappear over thousands of years. But the writer is drawing a picture from what has been found, and uses words such as “suggesting” and “apparently.” Our job is to understand that picture without turning the tentative claims into certainties or losing sight of them because we can imagine objections.

Agriculture and trade add to the account of a sophisticated society. The people cultivated rice and cotton and organized the production and distribution of food. They also traded beyond their own settlements. Standardized weights found at harbors and written records from Sumer support that connection. We have a civilization integrated into a wider trading world, not simply a collection of isolated cities.

Then the question changes: why did it decline? Wheeler's long-standing answer was a massacre by invading Indo-Aryans. The writer gives us reasons to reject it. There are no ancient Indian records of the event and no archaeological evidence of battles in the cities. More decisively, new excavations place the supposed invaders outside the region at the alleged time. The proposed attackers cannot explain a massacre there at a time when they weren't there.

What explanation better fits the new evidence? The civilization later reappeared farther south. That suggests relocation and a breakup into regional cultures, rather than the population simply disappearing in a final massacre. The writer favors catastrophic environmental causes for that movement.

The drought example shows how the process could work. If land becomes unfarmable, there may not be enough grain for a large urban population. People then have to leave the cities to find places where they can obtain food. The civilization can lose its large urban centers through people dispersing, without an invading army having destroyed them.

An earthquake offers another possible route. It could alter rivers and disrupt the cities, driving people into the countryside. Losing a reliable water supply could also make an urban population difficult to sustain. The writer presents drought and earthquake as possibilities within the environmental account, not as two events whose exact roles have been established.

So the new evidence changes two parts of the story. A supposedly unremarkable civilization turns out to have distinctive achievements, and its decline looks more like environmentally driven relocation than the invasion Wheeler proposed. We can identify that overall change while recognizing that the precise cause of the decline remains uncertain.