Why did so many early civilizations arise near river valleys?

Why would the isolation of buddhist monks contribute to the religion’s decline?

European expansion into africa left native regimes intact but had a strong impact on local societies what does this mean

Why did the meiji reformers want to modernize japan a) to colonize weaker nations in south east asia b) to allow western nations to protect them and treat negotiation c) to compete with the economics and military of western nations d) to replace additional prices with weston culture