What makes asian growth so phenomenal

Asian cities have been tended to grow more quickly than Western cities, so what makes their growth so phenomenal? The accelerated rate may be attributed to population dynamics, economic markets and or/socio-political conditions, poor planning and disregarding environmental hazards like flood plains have held them back. Many primate cities in Asia have grown to become megacities, and some more are rapidly increasing in size to assume such a status by the end of the century. This is a remarkable phenomenon fraught with various implications, favorable or unfavorable. In 1960 there were only two megacities in the region, which were, Tokyo and Shanghai. In 1970 Beijing was added, and Asia had three of 10 megacities in the world, or two of five in the developing world. By 1980 Bombay, Cacutta, Osaka, and Seoul also assumed similar status, and Asia had seven of 15 world megacities. In 1990, with Tianjin, Jakarta, Delhi, and Manila becoming megacities, developing Asia contained nine of 14 mega-cities in the less developed regions. In my opinion, I believe that the population dynamics are the most influential to urban growth.
Population Examination Over two centuries, from 18th century to 20th century, the level of mortality has changed dramatically in Asian countries. The demographers use life expectancy of birth, which is the average number of years that newborn baby can be expected to live, as a mean to measure the mortality level. Generally, the life expectancy of birth has increased rapidly from the beginning of 18th century. In some countries of Asia like Japan and Ceylon, the death rate has been tending to fall since the 1920’s. But in most countries it began to show a rapid tendency toward decline only after World War II. According to recent data, the death rate is 12.1 per 1,000 for India, 9.1 for Ceylon, 7.1-7.3 for Hongkong, Taiwan and the Philippines, and 6.5 per 1,000 for Singapore. If these death rates were expressed in terms of standardized death rates,