A(n) is an amendment introduced by a private citizen.

The correct answer is A Initiative.

Referendums have to do with only addressing a single, specific issue.

Federalist systems have to do with having a representative head to the government.

Supremacy clauses have to do with which laws are superior to others in case of conflict.

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.

your question is incomplete

explanation: