If the North only imported $31 million in goods in 1860 then why were collections from import duties in in fiscal year 1861 $49,056,397.62 and $69,059,642.65 in fiscal year 1863? Where were all those imports coming from to produce that tariff reveune?
You are having the same problem as your other little pal. You are misunderstanding or just simply deceptively asking the wrong question.
The data is that the North consumed $31 million in imported goods. What does that have to do with point of collection of tariffs?