Yes, having a massive fleet of warships throwing up a blockade around all your ports tends to discourage any import traffic.
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Are you being serious? Are you trying to compare revenue collection on imports during a state of war with revenue collection on imports during a time of peace?
Without the war preventing shipping from getting to the South, the south would have eaten the north's revenue streams.
An Independent Southern coalition was a major financial threat to the then existing monied power structure of the North East.
They're going to "eat our lunch," President Biden? As has been said countless times, goods coming into Southern ports from Europe and shipped north would either have to pay both Confederate and US tariffs or be broken down into smaller quantities for the risky business of smuggling. Shippers would also have to pay more in wages or fuel to make the longer trip to New Orleans. The Southern rail system was also far less extensive than the Northern. I believe the Maritime Charleston website quoted words to the effect that New York's economic hinterland stretched to Kentucky and beyond, while Charleston's barely reached East Tennessee, if that. Add to that difficulties with slave unrest, climate and disease and it doesn't look like the lunch was going to be eaten anytime soon.