Why was the union able to destroy the confederacy?

The Union was able to successfully create the blockade of most Southern ports; built ironclads to maintain the naval blockade
Captured New Orleans and had victories in Kentucky and Tennessee; captured Vicksburg; controlled the Mississippi River
Attempted to capture Richmond during the Battle of Bull Run but failed. Was later able to capture Richmond which led to the end of the war

The Union was to be a successfully creator of the blockade of most Southern ports built ironclads to maintain the naval blockadeCaptured New Orleans and had victories in Kentucky and Tennessee captured Vicksburg controlled the Mississippi RiverAttempted to capture Richmond during the Battle of Bull Run but failed. Was later able to capture Richmond which led to the end of the war

Well, a and b together would be negative. b alone would also be negative.

Apaid their profits to high officials