Why was the immediate impact of the emancipation proclamation limited

It applied only to slaves in states that had left the Union.

https://www.battlefields.org/learn/articles/10-facts-emancipation-proclamation

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The immediate impact of the Emancipation Proclamation, issued by President Abraham Lincoln on January 1, 1863, was limited for several reasons. To understand why, let's break it down.

1. Geographic Scope: The Emancipation Proclamation applied only to slaves residing in Confederate territory, which Lincoln had no direct control over at the time. As a result, it did not free any slaves immediately. Instead, it declared that all slaves in Confederate states "shall be then, thenceforward, and forever free" once the Union Army captured those areas.

2. Legal Authority: The Emancipation Proclamation was issued by President Lincoln as a wartime measure, using his executive powers as Commander-in-Chief. Consequently, it had limited legal authority. It did not change the existing slave laws or abolish slavery in the Union border states (such as Maryland, Delaware, Kentucky, and Missouri), where slavery was still legal.

3. Enforcement: Due to the ongoing Civil War, enforcing the Emancipation Proclamation in areas under Confederate control was difficult. The proclamation relied on Union military victories and territorial advancements to effectively free the slaves. However, it took several years for Union forces to gain control over Confederate territory and fully implement the proclamation.

4. Public Opinion: The Emancipation Proclamation faced opposition and criticism from various quarters. Many Northerners questioned its constitutionality and doubted its effectiveness. Additionally, European powers, such as Britain and France, did not openly support the proclamation, as they had economic ties to the Confederacy and were hesitant to intervene in the American Civil War.

Despite its immediate limitations, the Emancipation Proclamation played a crucial role in redefining the Union's war goals and promoting the abolitionist cause. Its significance grew over time as Union forces advanced and more slaves were freed. Ultimately, it paved the way for the passage of the 13th Amendment to the U.S. Constitution, which formally abolished slavery throughout the United States.