According to B. B. Lal, former DG of ASI, Kalibangan site shows that an earthquake occured around 2600 BC, which brought to an end the Early Indus settlement at the site. It is perhaps the earliest archaeologically recorded earthquake.
Kushans were most probably one of the five branches of the Yuezhi confederation. Kujula Kadphises was the first Yuezhi chief and he laid the foundation of the Kushana Empire in India. He established his supremacy over Kabul, Kandahar, and Afghanistan.
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