Answer:
China's one-child policy had been successful in lowering its birth rate, which has declined since the 1990s to an average of 1.5, which means on average women give birth to 1.5 children.
China's “one-child policy” (OCP) is the largest among the world's family planning programs. ... According to the World Bank, the fertility rate in China dropped from 2.81 in 1979 to 1.51 in 2000. The reduced fertility rate is likely to have affected the Chinese labor market profoundly.
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The world war 2 is the answer I think not sure
President Theodore Roosevelt oversaw the realization of a long-term United States goal—a trans-isthmian canal. Throughout the 1800's, American and British leaders and businessmen wanted to ship goods quickly and cheaply between the Atlantic and Pacific coasts.