Off topic, but I find it interesting. A quick and dirty estimate using your figures shows some interesting facts:
Army expenditures:
Army proper + Armories, Arsenals and Munitions of War - total expenditures approx. $11.5 million.
Navy expenditures:
Navy proper + Marine Corps - total approx. $10 million
Total military expenditures approx. $21.5 million
Postal expenditures:
Ocean mail steamer service - approx. $2 million
General mail transportation - approx. $6 million
Compensation of postmasters - approx. $2 million
Compensation of P.O clerks - approx. $1 million
Total Postal related expenditures - approx. $11 million
Total military + postal expenditures $32.5 million
Total government expenditures - $63.6 million
Over half of all tax dollars in 1856 went to postal or military expenditures, expenses which are in fact constitutionally justified. It’s a shame we got away from that type of government.
And yet we’re constantly assured by the Lost Causers that the majority of federal spending was in the north.