Answer:
They expanded their colonies by:
- Transportation
- Communication
- Warfare
- Ethnic and Cultural division
Step-by-step explanation:
Transportation:
It played a vital role as without ships it wouldn't have been possible to travel around the world.. Later, railways also became equally important.
Communication:
Communications were important for colonizers for organizing and coordinating among themselves and to take order from the home.
Warfare:
Colonizers used to have large armies, latest technologies and advance weapons which gave them a huge advantage when waging war on the local population.
Ethnic and Cultural Division:
Colonizers used the ethnic and cultural diversity of the population to their advantage, which allowed them to use hierarchical relations for their purposes and also increased their supporters.