International migration from sub-Saharan African countries to Europe and the U.S. has grown over the past decade. Many who live in sub-Saharan Africa say they would move to another country if they could.
A comprehensive demographic study finds that there are 2.18 billion Christians of all ages around the world, representing nearly a third of the estimated 2010 global population of 6.9 billion. Christians are also geographically widespread, and no single region can indisputably claim to be the center of global Christianity.
As of 1900, both Muslims and Christians were relatively small minorities in the region. Since then, however, the number of Muslims living between the Sahara Desert and the Cape of Good Hope has increased more than 20-fold, rising from an estimated 11 million in 1900 to approximately 234 million in 2010.
A comprehensive demographic study of more than 200 countries finds that there are 1.57 billion Muslims of all ages living in the world today, representing 23% of an estimated 2009 world population of 6.8 billion.
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