What was the significance of the proclamation not taking effect immediately?

" Impact of the Emancipation Proclamation

Black Americans were permitted to serve in the Union Army for the first time, and nearly 200,000 would do so by the end of the war. Finally, the Emancipation Proclamation paved the way for the permanent abolition of slavery in the United States. "

Would this help?

Explanation:

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.