Why do all usgs topographical maps use the same legend

HEY JEREMY!

Explanation:

A topographic map is a detailed and accurate two-dimensional representation of natural and human-made features on the Earth's surface. These maps are used fora number of applications, from camping, hunting, fishing, and hiking to urban planning, resource management, and surveying.

Map legend is a key to the symbols. It provides a complete listing of all the symbols used on the map and the corresponding features they represent. The legend can be located along the borders, below the map, or on the back of the map. Although many symbols used in different maps are similar, there is no one standard international legend for topographic maps. USGS topographic maps' legends. The margin of the map contains other important information such as map scale, north arrow, declination diagram, datum, publisher, date, etc.