Answer:
They expanded their colonies by:
Explanation:
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.
Communications were important for colonizers for organizing and coordinating among themselves and to take order from the home.
Colonizers used to have large armies, latest technologies and advance weapons which gave them a huge advantage when waging war on the local population.
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.
