During the mid-Qing period, population growth in China was fueled by economic prosperity, peace, and improved agriculture. Irrigation, fertilizer, and new crops from the Americas increased food production and nutrition. As a result, the Chinese population doubled to 300 million by 1800 and was healthier and more geographically mobile. However, traditional Confucian social structures persisted, favoring sons over daughters. Women's responsibilities outside the home coexisted with practices like foot-binding that caused lifelong suffering.