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in 1803, Napoleon sold French Louisiana to the United States, thus allowing to finance various war campaigns. How do 15 millions dollars compare to the cost of the napoleonic wars between 1803 and 1810, and how does it compare to France revenues at the time? Details on those revenues would be appreciated as well.

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i've heard he tried to trade it for iceland. –  john Feb 3 at 2:22
    
@HermannIngjaldsson ah, interesting. To use as a naval base? Seems like he'd be hard pressed to maintain supply routes there though. –  michel-slm Feb 5 at 2:37
    
i think he knew he was going to loose louisiana and get nothing for it anyways and might as well try to bargain for something. the french always had some presence in iceland, they were fishing there a lot. but yeah it would be hard to maintain trade routes there during war with britain. –  john Feb 5 at 8:29

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Not much. According to the Wiki:

By the terms of the Anglo-Russian agreement of 1803, Britain paid a subsidy of ₤1.5 million pounds for every 100,000 Russian soldiers in the field...

The whole cost of the war [for Britain] came to £831 million. By contrast the French financial system was inadequate and Napoleon’s forces had to rely in part on requisitions from conquered lands.

Assuming the cost was comparable to both sides, and taking 1 pound to be 20 francs, Louisiana Purchase was 68M francs ~ 3M pounds - at most 1% of war cost.

The sale of Louisiana to the US was a strategic move (the only good strategic move that Napoleon, the great tactician, has ever made) as opposed to a financial one; in that respect it is similar to the Alaska Purchase. Napoleon could not defend Louisiana against either Britain or US, and by selling it to the US he ensured, that when the US was deciding who to fight in 1812 (both Britain and France were nasty), there was little to gain from fighting France, so the US declared war on Britain.

PS. It has been argued in the comments that war was cheaper for France than for Britain. While the French 2.5M-strong army was conscripted, the 250k British army was volunteer. A British private was paid 7s/week, which amounts to 7s/week*52week/year*20years*250000men/20s/£ = £91M - about 11% of the total cost. Even if we assume that the war costs half as much for the French as for the British, still Louisiana purchase was only 6% of the war cost.

PPS. There are many side issues here: Britain subsidized other countries' armies, maintained a navy, fought on the perimeter, incurring higher transportation costs. France had a larger army (which had to be fed and clothed, and early industrial Britain got guns and clothes cheaper), and fought more countries. However, the central point remains that the value of Louisiana was two orders of magnitude lower than the cost of the wars. Even if creative accounting reduces the difference to a single order of magnitude, that is enough to see Louisiana purchase for what it was - a political and strategic move, rather than a financial one.

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@MarkC.Wallace: "non-asymmetrical" war costs cannot differ by an order of magnitude; "fascist" is an anachronism; France and Britain were not as different as you are portraying them. –  sds Feb 3 at 20:06
    
I thought the British soldiers where paid, while their french counterparts where conscripts. Wouldn't that make raising troops a lot cheaper for Napoleon? –  Jeroen K Feb 13 at 8:46
    
@JeroenK: see PS –  sds Feb 13 at 16:36
    
@MarkC.Wallace: see PPS –  sds Feb 13 at 17:31
    
Well done; I have deleted the comments I believe that you answered. –  Mark C. Wallace Feb 13 at 17:54

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