Europa Universalis IV is a grand strategy game with a lot of content. There are many ways to get your colonies to expand, but one of the most common methods is to build roads and railways. This will allow your colonists to move faster and easier from one place to another, and will also help you build up your economy. Another common way to get your colonies to expand is by building factories. Factory buildings will allow your colonists to produce different types of goods, which will then help you build up your economy even more. Finally, another way to get your colonies to expand is by recruiting other countries into your empire. This will give you access to their resources and manpower, which will then help you build up even more quickly and efficiently.