Why did early civilizations begin in river valleys?

There are several reasons why early civilizations began in river valleys. The main reason is the array of benefits that this brings to agriculture. Proximity to river valleys means that people are able to irrigate their crops more easily. Moreover, river valleys are often flooded, which brings valueable nutrients to the soil, making it more fertile. Besides agriculture, river valleys are important in various other ways. Rivers provide a reliable source of water for communities. They also allow people to travel easily, connecting faraway communities with each other.

by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.

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