Since the countries were becoming industrialized, they needed more and more resources. Since they couldn't have them in their own countries, they had to conquer others. That's why they would make colonies and spread their empires. That way they could take coal or oil or lumber or similar things from the colony and use it for their own purposes. Usually, they would leave nothing to the colony.
A colony created by a grant of land from a monarch to an individual or family is a;
A. Proprietary colony
A/Allied forces captured a few strategic pacific islands from the Japanese and then used those reclaimed islands as bases from which to advance the remaining targets -Apex
The tax was to help with the cost of maintaining the colonies
According to what I read above