Civilization 6 Research Agreements
City-states, a new feature in the series, are small civilizations that can interagulate, but are not able to achieve victory. Unlike the great powers, city-states can develop on the territory, but they never create new cities (although they can conquer other cities with military units). In addition to complete conquest, great civilizations have the opportunity to befriend city-states through bribes or services. City-states offer the player bonuses such as resources and units that increase as players ascend into new eras. In the “Beautiful New World” expansion package, city-states grant allied players additional delegates to the World Congress, which begins in the industrial era. There are three types of city-state in the base game, each with different personalities and bonuses: maritim, cultured, and militarist. Two other city-state types (merkantile and religious) have been added to the Gods & Kings expansion pack to complete new gameplay mechanics. City-states play a key role in diplomacy between great civilizations, make specific demands and give rewards.  As in previous matches, there are several ways to achieve victory. The player can focus on scientific research and become the first to assemble and start a spaceship and achieve a victory in the Space Race. The player can focus on a diplomatic victory that requires the support of other civilizations and city-states at the United Nations.
In Civilization V`s new cultural system, consisting of social policy “trees”,” the cultural victory over the Brave New World Expansion Pack was to fill five of the ten “trees” and complete the Utopia project (recalls the secret project of promoting transcendence to Sid Meiers Alpha Centauri).  Almost any civilization can enjoy a strong scientific income, regardless of your winning condition, and so maintaining that income is one of the most important things you can do to ensure a healthy late game. A Gold edition was published on February 12, 2013. It contains all the “Cradle of Civilization” map packs, the “Explorer`s Map Pack”, the “Wonders of the Ancient World Scenario Pack”, all the DLC civilizations and the Gods & Kings expansion pack.  Civilization V`s artificial intelligence (AI) must operate a four-tier civilization: tactical AI controls individual units; operational AI monitors the entire war front; strategic AI manages the entire Empire; and the big strategic AI sets long-term goals and determines how to win the game….