Which constitutional clause has been central in debates about defining marriage and divorce because it requires that states normally honor the public acts and judicial decisions of other states?

The correct answer is

Full Faith and Credit Clause

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

b) to encourage free trade