In short, suppression and eradication.
The Protestants of the early United States tended to avoid marrying and continuing the bloodlines of Native Americans due to obvious racial tension and prejudice against them. Native Americans were eradicated on a larger scale in North America rather than South America, so there would be a greater amount of Natives there. (This is because of a more complex and somehow tolerant society in the South) However, there were obviously the mestizos. While there <em>was </em>reproduction between white people and natives, it was typically a result of harassment or an uncommon desire to start a family.
In summary, the amount of Native descendants in the United States is significantly lower now than centuries before because of endless eradication and little amounts of pure-blood Native Americans being born.
kathmandu was a single political unit during the early period of of malla rule but after the end of the yakshya malla it was divided into three states,namely kantipur ,patan and Bhadgaon. similarly , there were kiranti kingdoms in the east and tirhut in the south.
British forces ended up fighting a war in China that benefitted drug smugglers. Their subsequent victory in the conflict opened up the lucrative Chinese trade to British merchants.