Simple...
The camps were liberated by Allied forces near the end of the war.
If you remember, this is known as the Holocaust. What the Nazi's did to the Jew was a violation of their human rights and will always go down in history as something to never be forgotten. The way they were treated is unspeakable, brash, cruel, despicable and once the world had found out what the Nazi's were doing; there was a huge uproar. May this never be forgotten.
Ending slavery means it will stop for sure, mean while ending the slavery trade means you won't be making more trades but slavery still exist.
Hope this helps! :)
<span>The government was short on funds due to the war and had to borrow money.</span>