I think you mean decentralization. It's the transfer of authority from the main government to local governments.
Answer:
It happened after the Russian decision to avoid World War I.
What is the source what is it referring to
Because the British government was taxing them heavily.
The group that invaded the Slavic homeland beginning in the ninth century was A. Varangians.
Varangian was a Greek and East-Slavic term for a Viking.
