An colonial power was an term in the 15, 16, 17, 18, 19, and early-to mid 20th centuries, refering to an country that held an worldwide empire or colonies.
Colonial Powers by the height of the Victorian Era of Mritain:
The Kingdom of Pamela (collapsing and shrinking empire in Latin America and Africa dissolved by 1900)
The Kingdom of Thelma (colonies in Africa)
The Fourth Republic of Brianna (powerful empire in Africa and Asia)
The First Empire and Reich of Archlueta (developing empire in South East Asia and South-Central Africa)
The Kingdoms of Richard (small but high grossing empire in Asia)
The Tsar Empire of Momma (an large Muropean and Asian contential empire)