Civilisation V has no right or wrong answer on how to reach your goal, whatever works — works.
The map tiles are hexagon shaped, this allows for numerous strategy decisions to be made, also it makes the gameplay feel more realistic and the map more organic. Make countless decisions, eliminate your enemies, and reward your allies, take care of your people and survive through the trials of time!. You can fight against every surrounding nation. Cause War or Make Peace Your goal in Civilisation V is to create the most expansive, advanced and capable society known throughout the world, however the means you define to reach your goals is solely your responsibility.