President George W Bush is in Africa to launch HIV/Aids, development and anti-terrorism initiatives.
But his visit has also highlighted the growing importance of oil imports for the United States.
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The US imports two thirds of its oil needs.
About 15% of that amount comes from West Africa and that figure is projected to rise to 25% in the next 10 years.
The oil sector in Sub-Saharan Africa is one of the fastest growing in the world.
Click here to see a map of Africa's oilfields Production has taken off in the Gulf of Guinea which includes Nigeria, Equatorial Guinea, Cameroon, Gabon, Angola and Congo.
By the end of 2003, hundreds of thousands of barrels of crude will be flowing from oil fields in Chad, through rain forests in Cameroon to tankers docked off the Atlantic coast.
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US military involvement
America may even eventually increase its military presence in the region to secure its oil supplies.
Sao Tome - which has big oil reserves - has invited the US Navy to build a port from which to patrol the Gulf of Guinea.
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http://news.bbc.co.uk/2/hi/business/3054948.stm