mention the causes for the emergence of new kingdoms in the north
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There are some causes for the emergence of new kingdoms of india in the northwest:
During the 2nd century BCE, the Maurya Empire became a collage of regional powers with overlapping boundaries. The whole northwest attracted a series of invaders between 200 BCE and 300 CE. The Puranas speak of many of these tribes as foreigners and impure barbarians (Mlecchas). First the Satavahana dynasty and then the Gupta Empire, both successor states to the Maurya Empire, attempt to contain the expansions of the successive before eventually crumbling internally due to the pressure exerted by these wars.
The invading tribes were influenced by Buddhism which continued to flourish under the patronage of both invaders and the Satavahanas and Guptas and provides a cultural bridge between the two cultures. Over time, the invaders became "Indianized" as they influenced society and philosophy across the Gangetic plains and were conversely influenced by it. This period is marked by both intellectual and artistic achievements inspired by cultural diffusion and syncretism as the new kingdoms straddle the Silk Road.