Many underdeveloped countries are not underdeveloped because of lack of resources and manpower but because of the people who are leading the country..
The real problem ties to former colonizers who still extract resources but through more sophisticated ways and having built dependence. This applies to the entire Africa and Middle-East regions. You can overthrow the government but nothing will change as long as all your economic activity is fully dependent on producing a limited variety of resources for a foreign giga corporations.