Cual es la composicion, de la placa norteamericana

La placa norteamericana es la placa tectónica continental en la que se asientan América del Norte (incluyendo Groenlandia), los archipiélagos de Cuba y las Bahamas en el mar Caribe, la parte occidental del océano Atlántico Norte (hasta la Dorsal Mesoatlántica), la mitad occidental de Islandia, una parte del océano

Explanation:

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

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