4. The principle of separation of powers is important because A. It allows the judicial branch to have a final say on all government decisions.
B. It sets up a framework for primary and general elections.
C. It gives the chief executive the leading authority, keeping the nation safe.
D. It allows branches to have different roles in government.

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.

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.