Грамматика и Лексика

Образуйте от слова COLONY однокоренное слово так, чтобы оно грамматически и лексически соответствовало содержанию текста.

Nowadays English is quickly becoming the global language, and it dominates the world in many ways. One of the reasons is the fact that Great Britain was a global power during the __________ days, and today America is, perhaps, the most powerful nation in the world.