It was a proclamation! Specifically proclamation 113. As for that proclamation being in effect to this date is only true to some degree. While Lincoln’s proclamation was rescinded technically after the civil was over, it set a precedent for it being used again. Habeus Corpus is currently suspended under the same type of executive orders that Lincoln implemented. Today anyone can be indefinitely detained without the privilege of Habeus Corpus thus IT IS STILL IN EFFECT TODAY!!