Manufactured goods account for 80% of Mexico’s exports, but over 300 assembly plants have shut down and moved to China, resulting in 300,000 job losses in Mexico and increased illegal immigration to the US. Venezuela heavily relied on oil exports but failed to diversify its economy, leading to economic problems when oil prices declined in the 1980s. China seeks to learn from Japan, which provides the most humanitarian aid and has the most technologically advanced economy, as thousands of Chinese students study there. Colombia has become highly urbanized, though many of the rural poor who migrated to cities now live in slums, and 3.5 million are internally displaced within the country.