Which power was shared by both the state government and the congress of the articles of confederation

Article 10 grants Committee of States same power as the Congress to decide those issues Congress has said Committee could decide

1) Declare war
2) Appoint military officers
3) Sign treaties
4) Make alliances
5) Appoint foreign ambassadors
6) manage relations with Native Americans (at the time)

Hope this helps :)

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.