▁of ▁the ▁French ▁government ▁ant agon ized ▁the ▁Spanish . ▁France ' s ▁unw illing ness ▁to ▁block ▁the ▁c ession ▁of ▁Tr in idad ▁to ▁Britain ▁was ▁one ▁of ▁the ▁things ▁that ▁most ▁ir rit ated ▁King ▁Carlos ▁IV . ▁Spanish ▁economic ▁interests ▁were ▁further ▁injured ▁when ▁Bon ap arte ▁sold ▁Louisiana ▁to ▁the ▁United ▁States , ▁whose ▁mer ch ants ▁competed ▁with ▁those ▁of ▁Spain . ▁Following ▁that ▁sale , ▁Carlos ▁wrote ▁that ▁he ▁was ▁prepared ▁to ▁throw ▁off ▁al liance ▁with ▁France : ▁" ne ither ▁break ▁with ▁France , ▁nor ▁break ▁with ▁England ." ▁ ▁Break down ▁ ▁Britain ▁ended ▁the ▁une asy ▁tr uce ▁created ▁by ▁the ▁Tre aty ▁of ▁Am iens ▁when ▁it ▁declared ▁war ▁on ▁France ▁in ▁May ▁ 1 8 0 3 . ▁ ▁The ▁British ▁were ▁increasing ly ▁anger ed ▁by ▁Napoleon ' s ▁re - order ing ▁of ▁the ▁international ▁system ▁in ▁Western ▁Europe , ▁especially ▁in ▁Switzerland , ▁Germany , ▁Italy ▁and ▁the ▁Netherlands . ▁K agan ▁arg ues ▁that ▁Britain ▁was ▁ir rit ated ▁in ▁particular ▁by ▁Napoleon ' s ▁assertion ▁of ▁control ▁over ▁Switzerland . ▁Furthermore , ▁Brit ons ▁felt ▁ins ult ed ▁when ▁Napoleon ▁stated ▁that ▁their ▁country ▁des erved ▁no ▁voice ▁in ▁European ▁affairs , ▁even ▁though ▁King ▁George ▁III ▁was ▁an ▁elect or ▁of ▁the ▁Holy ▁Roman ▁Empire . ▁ ▁For ▁its ▁part , ▁Russia ▁decided ▁that ▁the ▁inter vention ▁in ▁Switzerland ▁indicated ▁that ▁Napoleon ▁was ▁not ▁looking ▁toward ▁a ▁peace ful ▁resolution ▁of ▁his ▁differences ▁with