Decline of Indus Valley Civilisation (IVC) | History for UPSC CSE PDF Download

Decline of Indus Valley Civilisation

• There is evidence that by around 1800 BCE, most Mature Harappan sites in places like Cholistan had been abandoned.
• Concurrently, there was a population increase into new settlements in Gujarat, Haryana, and western Uttar Pradesh.
• Many scholars believe that climatic change was to blame for the fall of the Indus Valley Civilization.
• Some scholars believe that the drying of the Saraswati River, which began approximately 1900 BCE, was the primary cause of climatic change, while others believe that a large flood hit the area.
• Various components of the Indus Civilisation have been discovered in succeeding cultures, indicating that the civilization did not vanish suddenly owing to an invasion.
• Many researchers believe that changes in river patterns caused the big civilisation to disintegrate into smaller settlements known as late Harappan civilizations.

Decline of IVC

Decline of IVC - Causes

• Several reasons have been advanced.
• Climate change, deforestation, extreme flooding, river shifting and/or drying up, and misuse of the terrain are all examples.
• Some of these "causes" may be true for certain settlements, but they do not account for the collapse of the entire civilization.
• Eastward-moving monsoons, or winds that produce heavy rains, might have been another calamitous alteration in the Harappan climate.
• Monsoons may be beneficial or harmful to a climate, depending on whether they sustain or destroy flora and crops.
• By 1800 BCE, the Indus Valley temperature had become colder and drier, and a seismic event may have redirected or disturbed river systems, which were the Indus Valley Civilization's lifelines.
• The Harappans might have migrated eastward to the Ganges basin, where they might have established villages and isolated farms.
• These little towns would not have been able to create the same agricultural surpluses that huge cities require.
• Trade with Egypt and Mesopotamia would have suffered as a result of diminished products output.
• By roughly 1700 BCE, most of the towns of the Indus Valley Civilization had been abandoned.

Theories of Decline

• Some researchers, who believe in a cataclysmic collapse of civilization, have sought for proof of a terrible disaster that wiped out urban settlements.
• One of the most credible arguments for the Harappan civilization's demise is that it was devastated by enormous floods.
• That the loss occurred as a result of river course changes and the progressive drying out of the Ghaggar-Hakra river system.
• The towns were destroyed by barbaric Aryan invaders.
• that the expanding demands of the centres disrupted the ecosystem of the region and that the environment could no longer support them.

Aryan Invasion

Aryan's Route 

• Ramaprasad Chanda proposed the concept that the civilisation was destroyed by Aryan invaders, but he later altered his opinion, and Mortimer Wheeler expanded on it.
• Wheeler thought that the Aryan invasion annihilated the Harappan civilisation.
• Wheeler cited human skeleton remains discovered in the late stages of occupancy at Mohenjodaro as evidence of the Aryan slaughter.
• Wheeler contended that allusions in the Rig Veda to various types of forts, attacks on walled towns, and the deity Indra's epithet purandara (fort destroyer) all point to an Aryan invasion of the Harappan cities.
• The Rig Vedic Aryans' habitation area encompassed the Punjab and the Ghaggar-Hakra region.
• Wheeler assumed the Harappan towns were being mentioned in the Rig Veda because no other cultural groups had forts in this area during this historical period.

Natural Disasters

• Natural disasters, albeit not always immediate or singular, may have a role.
• There are silt detritus intervening between eras of settlement at numerous Indus towns, including Mohenjodaro, Chanhudaro, and Lothal, highlighting the likelihood of devastation caused by swelling rivers.
• Several layers of silt at Mohenjodaro show that the city was impacted by successive Indus floods, which led to the collapse of Harappan civilisation.
• Evidence of significant flooding appears to have separated distinct periods of occupancy in Mohenjodaro.
• The fact that the homes and streets of Mohenjodaro were repeatedly covered with silty clay and crumbled construction debris suggests this.
• The flood waters that had inundated the streets and houses appear to have left this silty clay behind.
• After the floodwaters subsided, the residents of Mohenjodaro rebuilt dwellings and streets on top of the wreckage from the old structures.
• This type of catastrophic flooding and subsequent reconstruction appears to have occurred at least three times.
• M. R. Sahni, subsequently followed by Robert L. Raikes and George F. Dales, suggested that the floods at Mohenjodaro were caused by human error.
• Tectonic movements were to blame.
• According to one idea, the Indus region is a seismically disturbed area, and tectonic movements resulted in the formation of a massive natural barrier that kept the Indus from flowing towards the sea. transforming the region surrounding Mohenjodaro into a massive lake

Ecological Imbalance

• Scholars like as Fairservis attempted to explain the Harappan civilization's decline in terms of environmental issues.
• Fairservis proposes that the civilisation fell because the expanding number of people and cattle could not be maintained by resources within the Harappan cultural zone, using current statistics to estimate population, land, food, and fodder requirements.
• So because human and cattle populations in these semi-arid areas were rapidly depleting the few trees, food, and fuel supplies, the delicate ecological balance of these semi-arid places was being disrupted.
• Over-cultivation, overgrazing, and excessive tree cutting for firewood and farming were all examples of Harappan over-exploitation of the environment.
• The combined requirements of Harappan townspeople, peasants, and pastoralists outstripped these places' limited production capacity.
• As a result, the landscape was worn out by an increasing population of human and animals confronted with limited resources.
• This would have resulted in the progressive disappearance of forests and grasslands, as well as decreased soil fertility, floods, droughts, and increased soil salinity.

Shifting away of Indus

• Changes in the course of the Indus River, according to Lambrick, might be the cause of the downfall of the Indus Valley civilization.
• The Indus is a shaky river system with a constantly moving bed.
• The Indus River relocated thirty kilometres away from Mohenjodaro, according to reports.
• Due to a lack of water, residents of the city and the adjacent food-producing villages fled the region.
• This happened several times throughout Mohenjodaro's history.
• The silt seen in the city is the result of a lot of sand and silt being blown in by the wind.
• This, in combination with crumbling mud, mud brick, and baked brick constructions, resulted in silt that was mistaken for flood silt.

Climatic Change

Climatic Change

• While Mohenjodaro may have become worn down as a result of natural floods, Harappan sites in the Ghaggar-Hakra valley suffered from progressive desiccation.
• According to D.P. Agarwal and Sood, the Harappan civilisation fell when the region became more arid and the river Ghaggar-Hakra dried up.
• They discovered that by the middle of the second millennium B.C., dry conditions had increased.
• Even a little loss in moisture and water availability in semi-arid locations like the Harappa might spell tragedy.
• It would have an impact on agricultural productivity, putting city economies under strain.

Decline of Trade

• The fall of the lapis lazuli commerce with Mesopotamia, according to Shereen Ratnagar, was a factor in the Harappan civilization's demise.
• However, whether this commerce was extremely important to the Harappans is questionable; hence, it could not have been a role in their demise.

Conclusion

Many experts think that climatic change was to blame for the fall of the Indus Valley Civilization. Most Harappan towns had been nearly totally abandoned by 1800 BCE. The communities in the foothills eventually declined as well. Some scholars believe that the drying of the Saraswati River, which began approximately 1900 BCE, was the primary cause of climatic change, while others believe that a large flood hit the area.