Bc they wanted to give away there secret
Answer:
Africa had several advanced civilizations during the Middle Ages. The kingdom of Zimbabwe, founded by the Shona people, was the largest kingdom in southern Africa. The people of this kingdom built a grand stone palace with gigantic walls. Timbuktu, a city in the kingdom of Mali, was a center of Islamic scholarship. The people of these kingdoms traveled across the Sahara to conduct trade. They traded with countries as far away as India and China.
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Answer:
By the time the Union Pacific and Central Pacific railroads met in Utah in 1869, Central Pacific had recruited thousands of additional workers directly from China. When the Transcontinental Railroad was complete, Chinese laborers made up over 90 percent of Central Pacific's workforce.
Explanation: