koreanhistory1-2, Exercise 3: The career of 2333 BC

Model answer (a sample; yours will differ):

1. [Source] The Tongguk tonggam (1485) is the basis for 2333 BC, tied to the fortieth year of Emperor Yao; other sources give different regnal years (the 50th, 1st and 25th), and the article does not say who calculated it.
2. [Source] South Korea's Dangi calendar counted years from 2333 BC and was in official use until 1961; 3 October, Gaecheonjeol, is National Foundation Day, a public holiday.
3. [Source] North Korea dates the founding to the early thirtieth century BC and, after a supposed tomb was excavated in 1994, claimed Dangun was a real person.
4. [My own reading] A number from a story has become part of public life in both states, which is a reason to treat it as a claim with a history rather than as a date the evidence supports; the Gojoseon article says the founding legend has no supporting evidence.