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One thing it shows is the shape of the Earth's surface in a certain region/place. They show things like the shape of mountains, or the elevation of a cliff.
Southward. The California current is a pacific ocean current that moves southward along the western coast of North America, beginning of southern British Columbia and ending of southern baja California peninsula. It is considered an eastern boundary current due to the influence of the North American coastline on its course.
Answer:
The construction of the railroad helped to build the Texas economy after the Civil war