Please help me! Can you please give me an idea about why European nations such as Great Britain explore and colonize various countries from the 15th-18th centuries?

There are three main reasons for European Exploration. Them being for the sake of their economy, religion and glory. They wanted to improve their economy for instance by acquiring more spices, gold, and better and faster trading routes. Also, they really believed in the need to spread their religion, Christianity.

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i hope this your understandings.