On Thursday, October 24, 1929, less than eight months into Herbert Hoover’s presidency. Most experts, including Hoover, thought the crash was part of a passing recession. By July 1931, when the President wrote this letter to a friend, Governor Louis Emmerson of Illinois, it had become clear that excessive speculation and a worldwide economic slowdown had plunged America into the midst of a Great Depression. While Hoover wrote to Emmerson that "considerable continuance of destitution over the winter" and perhaps longer was unavoidable, he was trying to "get machinery of the country into action.
I don't know which specific context you refer to - the Han Chinese have conquered many people.
So I will provide one example - in Taiwan, the aboriginal people were required to have Chinese names in their passports until recently, which means that every person was forced to adopt a Chinese name, and often their original name was dropped, and (over generation) forgotten. This has changed how people self-identify: weakening their indigenous sense of identity.
Answer:
C. Created competition and other countries began to explore new lands
