You asked about the advantages that the North and the South possessed at the start of the War to Prevent Southern Independence. Foremost for the North may be the industrial capacity that it possessed. This was to be a war in which both sides were to thoroughly organize their industrial...
You asked about the advantages that the North and the South possessed at the start of the War to Prevent Southern Independence. Foremost for the North may be the industrial capacity that it possessed. This was to be a war in which both sides were to thoroughly organize their industrial capacities to support the war effort as probably had been done in no previous war. Counting all kinds of factories from one-man blacksmith shops to huge textile mills and iron foundries, the South had fewer factory workers than the North had factories, so the North had a tremendous industrial advantage at the start of the War.
The North had a lot more free citizens from whom to draw the soldiers to make an army.
The North had a president who was very determined; he was also willing to take illegal and unconstitutional actions to prosecute his war: He raised an army without Congressional approval. He arrested Maryland legislators in the middle of the night and imprisoned them without charges to prevent them from voting for secession. He refused to meet with Confederate diplomats who had been sent to Washington to negotiate payment for U.S. property (such as forts and post offices, including Ft. Sumter) that were located in the C.S.A. (This was not illegal, but it shows his determination to have his war even if the other side did not want a war.) He made war on lawfully elected state governments without a Congressional declaration of war. (Some of the states of the U.S.A. had joined the Union with the stipulation, expressly made, that they could withdraw if remaining became more of a burden than an advantage; at that time it was considered that every state had the right to secede. However, northern politicians and industrialists were already beginning their plans for empire, so they would just start by reducing to a colonial status the states that had seceded.)
The North had a much more extensive system of railroads and more industry (such as iron mills) for keeping the railroads and trains repaired.
Most of the sea-going commercial shipping belonged to Northerners, as did most (or all?) of the ship-building yards.
The North had in place a long-established government; the South’s government was newly formed.
Though it was not a large one, the North already had an army; the South had none.
Though it was antiquated, the North already had a navy; the South had none.
As for southern advantages: The southern soldier was defending his homeland; his homeland was being invaded; his houses and crops and libraries and schools and courthouses were being burned; he was not fighting on foreign soil; this was motive to fight harder.
Between 1859 (when a penchant for forming volunteer rifle clubs began in Britain and spread to the South) and 1861, many volunteer rifle and artillery units appeared in the South.
Some of the best officers in the U.S. army, resigned and joined the C.S. army.
It is often said that southern men were better qualified to become soldiers because all of them hunted, thus they knew how to use firearms, and all of them rode horses, thus they could be good cavalrymen. This advantage may be made too much of, because there were rural areas of the North, particularly in the West (Wisconsin, Michigan, Indiana, Illinois, Iowa) where a good many men also possessed these skills.