Africa records the world's highest population growth rate largely because of sustained high birth rates and a youthful population structure. Many African cultures value larger families, and improvements in medicine have significantly reduced child mortality. This combination accelerates natural increase. In comparison, Asia's fertility decline, economic development, and urban lifestyle have slowed growth. North and South America also show moderate demographic expansion, driven mostly by migration and lower fertility. Africa's unique demographic momentum results from both social and economic factors, making it the fastest-growing continent in terms of population.