To conquer a territory, you are to declare war on the country to which it belongs. To do it, go to the map and select the territory you want to attack. Click the Declare war button. Having done so, you can attack the territory by clicking the Attack the selected territory button.
Then you can choose the machinery you want to be used in the attack and click the Attack button.
When the battle is over, you will see a report on it. If you win, you will be offered the following options:
- Capture all the resources available on the territory and return to the previous location.
- Conquer the territory, if the territory limit is not exceeded and the territory is not a country capital.