Which of the following correctly states a cause and effect that occurred during world war two

The need to supply combat hardware to the Allies changed the United States into a noteworthy military power.  

Explanation:

The U.S. military today are described in expansive measure by their extraordinary capacity to assault contradicting military powers with enough accuracy and speed to win against substantial chances. This capacity is, as much as any of the military's different highlights, demonstrative of their change over the previous decade and a half from powers custom fitted for real land war in Western Europe to those obviously better suited for the new sorts of fighting that have come to confront the country since the Berlin Wall descended in 1989.

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

answer; utilitarian;