Final answer:
A similarity between classical Greek and Roman government is the concept of a republic, with Greeks practicing a form of direct democracy and Romans evolving a system of representative democracy by electing officials.
Step-by-step explanation:
One example of a similarity between classical Greek and classical Roman government is the concept of a republic. In Greek city-states such as Athens, there was a system that allowed for broad political participation among free males, which can be seen as an early form of democracy. Roman political culture was deeply influenced by the Greeks and evolved towards a form of constitutional republicanism. In the Roman Republic, citizens elected representatives to act on their behalf, creating a system of government where the public had a say in the political process, albeit indirectly through their elected officials. This early form of representative democracy set the framework for future republics, including the modern United States