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Formation and characteristics of the empire

Although the Carthaginians retained the traditional Phoenician affinity for maritime trade and commerce, they were distinguished by their imperial and military ambitions: whereas the Phoenician city-states rarely engaged in territorial conquest, Carthage became an expansionist power, driven by its desire to access new sources of wealth and trade. It is unknown what factors influenced the citizens of Carthage, unlike those of other Phoenician colonies, to create an economic and political hegemony; the nearby city of Utica was far older and enjoyed the same geographical and political advantages, but never embarked on hegemonic conquest, instead coming under Carthaginian influence. One theory is that Babylonian and Persian domination of the Phoenician homeland produced refugees that swelled Carthage's population and transferred the culture, wealth, and traditions of Tyre to Carthage. The threat to the Phoenician trade monopoly—by Etruscan and Greek competition in the west, and through foreign subjugation of its homeland in the east—also created the conditions for Carthage to consolidate its power and further its commercial interests.

Another contributing factor may have been domestic politics: while little is known of Carthage's government and leadership prior to the third century BC, the reign of Mago I (c. 550–530), and the political dominance of the Magonid family in subsequent decades, precipitated Carthage's rise as a dominant power. Justin states that Mago, who was also general of the army, was the first Carthaginian leader to " in order the military system", which may have entailed the introduction of new military strategies and technologies. He is also credited with initiating, or at least expanding, the practice of recruiting subject peoples and mercenaries, as Carthage's population was too small to secure and defend its scattered colonies. Libyans, Iberians, Sardinians and Corsicans were soon enlisted for the Magonid expansionist campaigns across the region.

By the beginning of the fourth century BC, the Carthaginians had become the "superior power" of the western Mediterranean, and would remain so for roughly the next three centuries. Carthage took control of all nearby Phoenician colonies, including Hadrumetum, Utica, Hippo Diarrhytus and Kerkouane; subjugated many neighboring Libyan tribes, and occupied coastal North Africa from Morocco to western Libya. It held Sardinia, Malta, the Balearic Islands, and the western half of Sicily, where coastal fortresses such as Motya and Lilybaeum secured their possessions. The Iberian Peninsula, which was rich in precious metals, saw some of the largest and most important Carthaginian settlements outside North Africa, though the degree of political influence before the conquest by Hamilcar Barca (237–228 BC) is disputed. Carthage's growing wealth and power, along with the foreign subjugation of the Phoenician homeland, led to its supplanting of Sidon as the supreme Phoenician city state. Carthage's empire was largely informal and multifaceted, consisting of varying levels of control exercised in equally variable ways. It established new colonies, repopulated and reinforced older ones, formed defensive pacts with other Phoenician city states, and acquired territories directly by conquest. While some Phoenician colonies willingly submitted to Carthage, paying tribute and giving up their foreign policy, others in Iberia and Sardinia resisted Carthaginian efforts. Whereas other Phoenician cities never exercised actual control of the colonies, the Carthaginians appointed magistrates to directly control their own (a policy that would lead to a number of Iberian towns siding with the Romans during the Punic Wars). In many other instances, Carthage's hegemony was established through treaties, alliances, tributary obligations, and other such arrangements. It had elements of the Delian League led by Athens (allies shared funding and manpower for defense), the Spartan Kingdom (subject peoples serving as serfs for the Punic elite and state) and, to a lesser extent, the Roman Republic (allies contributing manpower and tribute for Rome's war machine).

In 509 BC, Carthage and Rome signed the first of several treaties demarcating their respective influence and commercial activities. This is the first textual source demonstrating Carthaginian control over Sicily and Sardinia. The treaty also conveys the extent to which Carthage was, at the very least, on equal terms with Rome, whose influence was limited to parts of central and southern Italy. Carthaginian dominance of the sea reflected not only its Phoenician heritage, but an approach to empire-building that differed greatly from Rome. Carthage emphasized maritime trade over territorial expansion, and accordingly focused its settlements and influence on coastal areas while investing more on its navy. For similar reasons, its ambitions were more commercial than imperial, which is why its empire took the form of a hegemony based on treaties and political arrangements more than conquest. By contrast, the Romans focused on expanding and consolidating their control over the rest of mainland Italy, and would aim to extend its control well beyond its homeland. These differences would prove key in the conduct and trajectory of the later Punic Wars.

By the third century BC, Carthage was the center of a sprawling network of colonies and client states. It controlled more territory than the Roman Republic, and became one of the largest and most prosperous cities in the Mediterranean, with a quarter of a million inhabitants.

Carthage did not focus on growing and conquering land, instead, it was found that Carthage was focused on growing trade and protecting trade routes. The trades through Libya were territories and Carthage paid Libyans for access to this land in Cape Bon for agricultural purposes until about 550 BC. In around 508 BC Carthage and Rome signed a treaty to keep their commercial planes separate from each other. Carthage focused on growing their population by taking in Phoenicians colonies and soon began controlling Libyan, African, and Roman colonies. Many Phoenician cities also had to pay or support the Carthaginian troops. Punic troops would defend cities and these cities had few rights.