The centralization of Europe happened during the late third century and the early second century. It ultimately resulted in the transfer of western Europe from various tribes to city-states and nations. One of the main reasons for the centralization was increased Senone trade with the local tribes, and the establishment of trading cities. The centralization of Europe would have extreme influence over the world, and the nations in this region are still drivers of worldwide trade and politics.
After the Senone had centralized, they began to expand their power by setting up trading routes to the north. Soon, this became a major economic boast to the new nation, and quickly trade routes were established. This brought wealth to the traders, and by extension the rest of the country. The creation of the trade routes also affected the Gallic tribes, as they became more reliant on Senone goods. As the trade continued, it became the main industry of the Senone, with most of their economy being either reliant on trade or reliant on goods from trading.
The First Cities
As the Senone traded across western Europe, they began to create small towns across the continent, originally as rest stops. However, as these villages grew, they became major trading stops for both sides. This resulted in many Gauls moving in and around these cities, making them grow in both size and importance. As the cities grew, they fell more or less out of Senone control and into the grasp of various Gaulic leaders. These Cities gradually grew to become centers of population, and as they grew, the Gaulic tribes became more centralized and agricultural. Eventually, these cities began to serve as capitals to the tribes that were based there, and thus gained even more importance to both the tribes and the Senone.
Establishment of States
As Gaulic populations became more centered around Cities, forms of urban government became increasingly necessary. At first, these came in the form of small garrisons lead by a local chieftain, who mostly ruled according to personal whims. However, as populations increased, this became less and less viable, and Chieftains began to lose power. However, In Orleans, a chieftain called Enchar began to fashion himself as the monarch of the city, essentially creating a state. This was very successful, and the new city-state quickly centralized, spawning chieftains copying the so called "Orleans method." With several major states centralized, Europe moved from a collection of tribes people to an area of centralized states.