The Etruscan civilization () is the modern name given to a powerful and wealthy civilization of ancient Italy in the area corresponding roughly to Tuscany, western Umbria and northern Lazio. As distinguished by its unique language, this civilization endured from before the time of the earliest Etruscan inscriptions (c. 700 BC) until its assimilation into the Roman Republic, beginning in the late 4th century BC with the Roman-Etruscan Wars. Culture that is identifiably Etruscan developed in Italy after about 800 BC, approximately over the range of the preceding Iron Age Villanovan culture. The latter gave way in the 7th century BC to a culture that was influenced by Ancient Greek culture.
Expansion
Etruscan expansion was focused both to the north beyond the Apennine Mountains and into Campania. Some small towns in the sixth century BC disappeared during this time, ostensibly consumed by greater, more powerful neighbours. However, it is certain that the political structure of the Etruscan culture was similar to, albeit more aristocratic than, Magna Graecia in the south. The mining and commerce of metal, especially copper and iron, led to an enrichment of the Etruscans and to the expansion of their influence in the Italian peninsula and the western Mediterranean Sea. Here, their interests collided with those of the Greeks, especially in the sixth century BC, when Phocaeans of Italy founded colonies along the coast of Sardinia, Spain and Corsica. This led the Etruscans to ally themselves with Carthage, whose interests also collided with the Greeks.  Around 540 BC, the Battle of Alalia led to a new distribution of power in the western Mediterranean. Though the battle had no clear winner, Carthage managed to expand its sphere of influence at the expense of the Greeks, and Etruria saw itself relegated to the northern Tyrrhenian Sea with full ownership of Corsica. From the first half of the 5th century BC, the new political situation meant the beginning of the Etruscan decline after losing their southern provinces. In 480 BC, Etruria's ally Carthage was defeated by a coalition of Magna Graecia cities led by Syracuse, Sicily. A few years later, in 474, Syracuse's tyrant Hiero defeated the Etruscans at the Battle of Cumae. Etruria's influence over the cities of Latium and Campania weakened, and the area was taken over by Romans and Samnites.  In the 4th century BC, Etruria saw a Gallic invasion end its influence over the Po Valley and the Adriatic coast. Meanwhile, Rome had started annexing Etruscan cities. This led to the loss of the northern Etruscan provinces. Etruria was conquered by Rome in the 3rd century BC.

Q: When did the Etruscans expand?
A: Etruscan expansion was focused both to the north beyond the Apennine Mountains and into Campania. Some small towns in the sixth century BC disappeared during this time,
What was the outcome of this focus?
The mining and commerce of metal, especially copper and iron, led to an enrichment of the Etruscans and to the expansion of their influence in the Italian peninsula
The mining and commerce of metal, especially copper and iron, led to an enrichment of the Etruscans and to the expansion of their influence in the Italian peninsula