Korean Political History II: Chapter 6, Exercise 1 — Possible Solution
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STEPS
17 Dec 2011: declared "great successor to the revolutionary cause" after his
father's death.
April 2012: First Secretary of the Workers' Party.
July 2012: promoted to marshal, consolidating military control.
January 2021: General Secretary (Chapter 3).

DATED BY THE SOURCE
The 2011 declaration, April 2012 and July 2012. The 2021 date is from
Chapter 3's source.

NOT COVERED
The sources here give no date for the State Affairs Commission chairmanship
(Chapter 4 says the commission dates from 2016).