Answer:
The phrase means that European powers should leave the continent, allow Africans to become independent nations and refrain from interfering in their economy. It was a claim similar to the Monroe Doctrine: Africans don't interfere in Europe, Europeans shouldn't interfere with Africa.
They wove baskets/ put dirt and a crop seed in it and placed it on the lake. When it was time to harvest the lake they pulled it towards the land and collected the crop.
