Final answer:
The minie ball increased the range and lethality of rifles in the Civil War, changing battle tactics and making infantry engagements more deadly and decisive.
Step-by-step explanation:
The invention of the minie ball bullet significantly shaped the outcome of the Civil War by increasing the lethality and range of infantry firearms. The minie ball was a conical bullet with a hollow base that expanded when fired, which allowed it to engage the rifling of the barrel and impart a spin to the bullet, greatly increasing its accuracy and distance. This advancement made it possible for soldiers to fire effectively at longer ranges which, combined with the use of improved weapons like the breech-loading and repeating rifles, led to more deadly and decisive engagements. Additionally, it reduced the need for traditional line infantry tactics, favoring instead entrenchments and defensive positions, which fundamentally changed the dynamics of battle and warfare during the Civil War era.