Events such as the American Civil War and the Emancipation Proclamation significantly influenced Abraham Lincoln's leadership. His commitment to preserving the Union shaped his policies and decisions during this tumultuous period. The moral imperative of ending slavery became increasingly central to his agenda, culminating in the Emancipation Proclamation of 1863, which declared the freedom of slaves in Confederate states. Lincoln's ability to navigate the complex political landscape and unite a divided nation demonstrated his strong leadership. His speeches and writings reflect deep convictions about equality and human rights, making his presidency a cornerstone of American history.