Please help i will give brainliest!

1. true?

2. great britain, my assumption.

3. politburo

4. dissension

5. russia (did you misspell

6. berlin

7. romania

8. roads

9. mikhail gorbachev

10.   yugoslavia

11. cruel

12. bolsheviks

13. reduced the secret police

hopefully i you out with this! °ω°

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.

declare war, appoint military officers, sign treaties, make alliances