Why would europeans build transportation and communication networks in their colonies?

As European states extended their influence over seas, AGU political argument for imperialism gained prominence. Even if colonies were not economically beneficial, imperialist held that it was crucial for a political and military reasons to maintain them. Some overseas colonies occupied strategic sites on the worlds see lanes, and others offered harbors and supply stations for commercial and naval ships dock. Add the kids for imperialism sought to gain these advantages for their own states in equally important to deny them to rivals.