"C. was overthrown by invading Mongol tribes in A.D. 1279" would be the best phrase describing China's Song Dynasty, but this was of course not always the case.
Scottish<span> settlers continued to come to </span>Ireland<span> throughout the seventeenth and eighteenth centuries. </span>Scots-Irish<span> immigrants settled in the </span>American<span> colonies from the 1600s. ... The majority of the </span>Scots-Irish<span> who came to </span>America<span> in the colonial period settled in Pennsylvania, Virginia, and the Carolinas.</span>
15th century
The transatlantic slave trade began during the 15th century when Portugal, and subsequently other European kingdoms, were finally able to expand overseas and reach Africa. The Portuguese first began to kidnap people from the west coast of Africa and to take those they enslaved back to Europe.
