I think the answer is either C. or B. take your pick I am leaning more towards C. though I hope this helps :)
Lincoln's 1857 Emancipation Proclamation warned that the issue of slavery could destroy the nation.
Answer: Option A
<u>Explanation:</u>
This proclamation was given by Abraham Lincoln when the civil war was in its third year. The proclamation changed the status of almost 3.5 million slaves. The slaves were freed post the proclamation.
Slavery was a major issue that had led to the civil war and this proclamation changed the manner in which slavery was viewed.
The proclamation made freeing the slaves an explicit goal of the war. The proclamation did not lead to immediate abolition of slavery but ensured that most of the slaves in the Union were freed.
The Ottoman wars in Europe were a series of military conflicts between the Ottoman Empire and various European states dating from the Late Middle Ages up through the early 20th century.
But I would tell about the main one which change the face of Europe.
1453 — fall of Constantinople that was a great start to conquer Europe.
The attackers were commanded by the Sultan Mehmed II, who defeated an army commanded by Emperor Constantine XI Palaiologos and took control of the imperial capital, ending a 53-day siege that began on 6 April 1453.
