American culture flourished following independence, led by scholars like Noah Webster and artists like Charles Willson Peale. Republican virtues of self-reliance and sacrifice were promoted. Schools added programs to educate republican women. The population doubled every 20 years to over 12 million by 1830, driven largely by births rather than immigration. Mobility increased as people moved west for new opportunities. Dating replaced arranged marriages as women gained independence in choosing partners. The Second Great Awakening sparked religious revivals and growth of new denominations. Improvements in travel, trade, and specialization supported a growing economy and rise of businesses and shopping.