Can someone please help me

Constitutional Monarchies: Belgium, Denmark, Spain, the Netherlands, Sweden, Luxemburg and the United Kingdom.

Federal Republics: Germany and Austria.

Centralised Republics: Bulgaria, Cyprus, Malta, Czech Republic, Estonia, Finland, Franca, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Poland, Portugal, Romania, Slovakia and Slovenia.

Explanation:

In the constitutional monarchies, the head of state is the monarch, who has no truly political powers, whose main function is to represent the state.

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.