If poor, disease ridden people in Africa or earthquake stricken, mass grave digging people in Haiti are just as happy as we are, then might I suggest that we leave them to their subsistence lifestyle and tragic suffering. We should not be sending food to them, building their schools and wells or buying them goats. If those activities cannot increase their happiness, it's all a waste of resources.
On the other hand, if they have come to depend for their livelihood on the excess of American wealth and the generosity of affluent societies, perhaps it would be more in their interest to adapt to our socio-economic model. Any nation that adopts the American principles of personal liberty and economic freedom embodied by America 200 years ago will become a net asset to whatever region of the world that nation is in.
Poverty is curable but it's not the US' job to nurse the world because other cultures won't accept the medication.