Sometimes to expect the best from everyone is arrogance.

In the 8th century BC, Greece began to emerge from the Dark Ages which followed the fall of the Mycenaean civilization. Literacy had been lost and Mycenaean script forgotten, but the Greeks adopted the Phoenician alphabet, modifying it to create the Greek alphabet. From about the 9th century BC written records begin to appear. Greece was divided into many small self-governing communities, a pattern largely dictated by Greek geography: every island, valley and plain is cut off from its neighbors by the sea or mountain ranges. The Lelantine War (c. 710 – c. 650 BC) is the earliest documented war of the ancient Greek period. It was fought between the important poleis (city-states) of Chalcis and Eretria over the fertile Lelantine plain of Euboea. Both cities seem to have suffered a decline as result of the long war, though Chalcis was the nominal victor.

A mercantile class arose in the first half of the 7th century, shown by the introduction of coinage in about 680 BC. This seems to have introduced tension to many city-states. The aristocratic regimes which generally governed the poleis were threatened by the new-found wealth of merchants, who in turn desired political power. From 650 BC onwards, the aristocracies had to fight not to be overthrown and replaced by populist tyrants. This word derives from the non-pejorative Greek τύραννος tyrannos, meaning 'illegitimate ruler', and was applicable to both good and bad leaders alike.

A growing population and a shortage of land also seem to have created internal strife between the poor and the rich in many city-states. In Sparta, the Messenian Wars resulted in the conquest of Messenia and enserfment of the Messenians, beginning in the latter half of the 8th century BC, an act without precedent or antecedent in ancient Greece. This practice allowed a social revolution to occur. The subjugated population, thenceforth known as helots, farmed and labored for Sparta, whilst every Spartan male citizen became a soldier of the Spartan Army in a permanently militarized state. Even the elite were obliged to live and train as soldiers; this commonality between rich and poor citizens served to defuse the social conflict. These reforms, attributed to the shadowy Lycurgus of Sparta, were probably complete by 650 BC.

Athens suffered a land and agrarian crisis in the late 7th century, again resulting in civil strife. The Archon (chief magistrate) Draco made severe reforms to the law code in 621 BC (hence "draconian"), but these failed to quell the conflict. Eventually the moderate reforms of Solon (594 BC), improving the lot of the poor but firmly entrenching the aristocracy in power, gave Athens some stability.

By the 6th century BC several cities had emerged as dominant in Greek affairs: Athens, Sparta, Corinth, and Thebes. Each of them had brought the surrounding rural areas and smaller towns under their control, and Athens and Corinth had become major maritime and mercantile powers as well.

Rapidly increasing population in the 8th and 7th centuries had resulted in emigration of many Greeks to form colonies in Magna Graecia (Southern Italy and Sicily), Asia Minor and further afield. The emigration effectively ceased in the 6th century by which time the Greek world had, culturally and linguistically, become much larger than the area of present-day Greece. Greek colonies were not politically controlled by their founding cities, although they often retained religious and commercial links with them.

The emigration process also determined a long series of conflicts between the Greek cities of Sicily, especially Syracuse, and the Carthaginians. These conflicts lasted from 600 BC to 265 BC when Rome entered into an alliance with the Mamertines to fend off the hostilities by the new tyrant of Syracuse, Hiero II and then the Carthaginians. This way Rome became the new dominant power against the fading strength of the Sicilian Greek cities and the Carthaginian supremacy in the region. One year later the First Punic War erupted.

In this period, there was huge economic development in Greece, and also in its overseas colonies which experienced a growth in commerce and manufacturing. There was a great improvement in the living standards of the population. Some studies estimate that the average size of the Greek household, in the period from 800 BC to 300 BC, increased five times, which indicates a large increase in the average income of the population.

In the second half of the 6th century, Athens fell under the tyranny of Peisistratos and then of his sons Hippias and Hipparchos. However, in 510 BC, at the instigation of the Athenian aristocrat Cleisthenes, the Spartan king Cleomenes I helped the Athenians overthrow the tyranny. Afterwards, Sparta and Athens promptly turned on each other, at which point Cleomenes I installed Isagoras as a pro-Spartan archon. Eager to prevent Athens from becoming a Spartan puppet, Cleisthenes responded by proposing to his fellow citizens that Athens undergo a revolution: that all citizens share in political power, regardless of status: that Athens become a "democracy". So enthusiastically did the Athenians take to this idea that, having overthrown Isagoras and implemented Cleisthenes's reforms, they were easily able to repel a Spartan-led three-pronged invasion aimed at restoring Isagoras. The advent of the democracy cured many of the ills of Athens and led to a 'golden age' for the Athenians.

The Hellenistic period lasted from 323 BC, which marked the end of the Wars of Alexander the Great, to the annexation of Greece by the Roman Republic in 146 BC. Although the establishment of Roman rule did not break the continuity of Hellenistic society and culture, which remained essentially unchanged until the advent of Christianity, it did mark the end of Greek political independence.

During the Hellenistic period, the importance of "Greece proper" (that is, the territory of modern Greece) within the Greek-speaking world declined sharply. The great centers of Hellenistic culture were Alexandria and Antioch, capitals of Ptolemaic Egypt and Seleucid Syria respectively.

The conquests of Alexander had numerous consequences for the Greek city-states. It greatly widened the horizons of the Greeks and led to a steady emigration, particularly of the young and ambitious, to the new Greek empires in the east. Many Greeks migrated to Alexandria, Antioch and the many other new Hellenistic cities founded in Alexander's wake, as far away as what are now Afghanistan and Pakistan, where the Greco-Bactrian Kingdom and the Indo-Greek Kingdom survived until the end of the 1st century BC.

After the death of Alexander his empire was, after quite some conflict, divided among his generals, resulting in the Ptolemaic Kingdom (based upon Egypt), the Seleucid Empire (based on the Levant, Mesopotamia and Persia) and the Antigonid dynasty based in Macedon. In the intervening period, the poleis of Greece were able to wrest back some of their freedom, although still nominally subject to the Macedonian Kingdom.

The city-states within Greece formed themselves into two leagues; the Achaean League (including Thebes, Corinth and Argos) and the Aetolian League (including Sparta and Athens). For much of the period until the Roman conquest, these leagues were usually at war with each other, and/or allied to different sides in the conflicts between the Diadochi (the successor states to Alexander's empire).

The Antigonid Kingdom became involved in a war with the Roman Republic in the late 3rd century. Although the First Macedonian War was inconclusive, the Romans, in typical fashion, continued to make war on Macedon until it was completely absorbed into the Roman Republic (by 149 BC). In the east the unwieldy Seleucid Empire gradually disintegrated, although a rump survived until 64 BC, whilst the Ptolemaic Kingdom continued in Egypt until 30 BC, when it too was conquered by the Romans. The Aetolian league grew wary of Roman involvement in Greece, and sided with the Seleucids in the Roman-Syrian War; when the Romans were victorious, the league was effectively absorbed into the Republic. Although the Achaean league outlasted both the Aetolian league and Macedon, it was also soon defeated and absorbed by the Romans in 146 BC, bringing an end to the independence of all of Greece.

The Greek peninsula came under Roman rule during the 146 BC conquest of Greece after the Battle of Corinth. Macedonia became a Roman province while southern Greece came under the surveillance of Macedonia's prefect; however, some Greek poleis managed to maintain a partial independence and avoid taxation. The Aegean islands were added to this territory in 133 BC. Athens and other Greek cities revolted in 88 BC, and the peninsula was crushed by the Roman general Sulla. The Roman civil wars devastated the land even further, until Augustus organized the peninsula as the province of Achaea in 27 BC.

Greece was a key eastern province of the Roman Empire, as the Roman culture had long been in fact Greco-Roman. The Greek language served as a lingua franca in the East and in Italy, and many Greek intellectuals such as Galen would perform most of their work in Rome.