Japan and Chine have the highest IQ rates while Central Africa has the lowest. This translates into difficulty in immigrant integration into foreign cultures, unemployment, frustration and crime.
"Several Asian countries, such as Japan and China, have an average IQ of 107. Sweden and several European countries have an average IQ of around 100. Many African states, such as Somalia, Congo, Tanzania, Uganda, Sudan, Angola, Rwanda have an average IQ of about 70. Several Arab countries, such as Iraq, also have an average IQ level significantly below the Swedish."
World IQ map featuring the average IQ of Somalis' compared to the rest of the world.