An increase in the nation's agricultural output as there was an rural-urban drift to the neglect of agriculture
Simple. One country might have some materials, goods, etc., that is vital for another country. These countries trade so that they are able to access the resources that other nations provide.
Generally speaking, a stance that supports a particular interpretation of history is known as a "<span>Historical argument," although there can still be bias involved depending on the historian's delivery. </span>
