What was the impact of the Etruscans and Greeks on the early deveopment of Roman Civilization?

The Etruscans were the dominant influence in the area, and
contributed heavily to Roman Civilization.  Among their
contributions:

They were the first to use the Arch for
building bridges.  It is a form that adds strength, and dissipates the weight of a
structure.  It is from the Arch that we get our word “architecture.”  They also
introduced soothsayers, and gods with human forms, mostly borrowed from the Greeks, of
course.  They held slave fights – typically at funerals, as a blood memorial to one’s
greatness. These were the forerunner of the Gladiatorial games. They also started public
parades as welcomes for War heroes. Finally, they adopted the Greek alphabet; somewhat
altered, but in use still today. By and large, the Etruscans probably contributed more
than the Greeks, as much of the culture we consider "Roman" originated with the
Etruscans.