On his last day in office, former US secretary of state Mike Pompeo was still spreading rumors against China by claiming "genocide" in Xinjiang Uygur autonomous region. Ironically, the words of Pompeo and his successor make people wonder why US politicians are so interested in the word "genocide". Some US scholars estimated that before the White immigrants arrived in North America in 1492, there were at least 15 million indigenous people living there; They helped the white immigrants to survive but the latter brought guns, viruses, as well as used cruel measures such as scalping to pay back.