Answer:
B
Explanation:
A is not right it didn't end any colonialism, C is wrong because there are leaders in a government system, D is also wrong because its not the Emancipation Proclamation that freed all slaves in the south and in the north.
It would be c bc it subtracts 5000 with 49000 then divide
The Emancipation Proclamation changed the focus of the war.
Up until September 1862, the main focus of the war had been to preserve the Union. With the issuance of the Emancipation Proclamation freedom for slaves now became a legitimate war aim.
It also allowed 'Colored' men to join the US Army.
I believe that would be the "just - world phenomenon".
Hope it helps!