This is the Grand Canal that served to bring water from the south to the north of China. It served agriculture, navigation and trade purposes. The Great Wall runs from east to west in northern China. And the yellow line does not correspond to the course of either the Yangtze or the Huang He rivers.
Oklahoma served as a transportation corridor for their rival military and economic ventures.
This is because it was situated at the border, that is on the northern fringe of Spanish exploration of North America and on the western fringe of French exploration
