How did the U. S. Constitution solve a problem created by the Articles of Confederation?

A. It stopped the national government from imposing taxes.
B. It gave the national government the power to raise an army.
C. It required unanimous consent of the states to pass amendments.
D. It prevented acts of piracy against American ships off the coast of Africa.

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