How did the Oyo people impose political unity over the Yoruba during the seventeenth century?

Question

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The Oyo people imposed political unity over the Yoruba during the seventeenth century with a well-trained cavalry. The Oyo Empire had a professional army that included a skilled cavalry, which enabled them to effectively conquer and control neighboring regions. They also established a system of tribute collection, which further solidified their political authority over the Yoruba.

How Did the Oyo People Impose Political Unity Over the Yoruba