Imagine that there had been no blockade of the confederate coastline. how might such a situation have in the uenced the outcome of the civil war

If there was no blockade, the Confederacy would have gotten foreign aid from France or others. That would increase their imports and given them more supplies. They would have also been able to export cotton, their major crop, for money. The blockade stopped them from doing that and basically choked them into defeat, that is why it was called the Anaconda Plan.