Europeans carried a hidden enemy to the Indians: new diseases. Native peoples of America had no immunity to the diseases that European explorers and colonists brought with them. Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians.
Hope I helped! ☺
Personally I’d say classmate of different genders. They all come from different families, they have a different gender, and race.
The Chinese, The Soviet Union, and North Korea
To pay veterans and other obligations