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Mwangi said their experience showed "how broken" countries in East Africa were.

Karua is a respected human rights advocate, and a vocal critic of what she calls "democratic backsliding" in East Africa.

It had long been fighting expansionist wars, extending the kingdom to include more and more of East Africa.

She was born and raised in San Jose, California, but her parents both emigrated to the US from East Africa in their twenties.

The production of ornamental plants is growing fast and expanding geographically, particularly in East Africa and South America.