yes, they were a big part, but not the largest part, by far!
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According to the Phillips Junior School Atlas which I read in school, Libya is the richest country in Africa. The reason for this is mainly due to its oil reserves, but most of North Africa, like Tunisia, Morocco and Egypt also have many natural resources which make them rich. Economically however, South Africa is probably Africa's richest country, but according to the book, it was classed as 'poor' or 'very poor'. There is no exact answer, this is just information which I learnt from the book I read.
cheese
I don't think there can be any logical reasoning for why a nation would be imperialistic, however many nations adopted this philosophy because their homelands could not support the needs for natural and limited resources. Such a nation is England, which could not produce many resources it needed, and so it began to colonize much of the world in order to take those places' resources. This is one main reason for Imperialism in many nations from the beginning of the Age of Exploration up until the end of World War II and the fall of many remaining empires.
To increase their wealth and powerGaining income and raw materials
The explorers such as Christopher Columbus were sent by Kings or Queens that the explorers' countries affiliated with. Kings' or Queens' reason was for the expansion of their country. Increase in wealth, finding new resources such as gold.