Historically, many European nations had colonies in Africa. However, Europe never "owned" the continent.
Every country belongs to a continent. Perhaps you mean which continent is not owned by a country, in which case the answer is Antarctica.
It is not "owned" by any continent. It is part of the continent of Europe.
Africa is actually owned by a lot of other countries. England is no longer a colonial power, and it does not presently own Africa or any nation in Africa. Note that even at the peak of the British Empire, England never owned the entire African continent, which was also colonized by France and Belgium.
Please note that the diamond mines in Africa are not owned by Africans, but by immigrants who purchased the land, and who mine the natural resources of the continent.
Telkom Group Ltd primarily operates in South Africa. The company is a telecommunications provider and is partially owned by the state by 39%. Telkom operates in 38 countries in Africa.
Antarctica is the only continent not owned by any nation. It is governed by the Antarctic Treaty System, which regulates international relations regarding the continent and prohibits military activity and mineral mining.
No naturally occurring source of diamonds exists on the European continent, but many diamonds are owned and used by people and industries in every European country.
Antarctica is the only continent not owned by any nation. It is governed by the Antarctic Treaty System, which designates it as a scientific preserve and prohibits military activities.
The British colonial Empire had the largest colonial extent of all countries. It owned colonies on every continent, of course leaving out Antarctica.
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What if every family owned a helicopter?