What was the most important instrument of government in the roman republic?
a) emperor
b) magistrates
c) the triumvirate
d) legislative assemblies

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

hope this : )