Answer:
B
Explanation:
A steppe is a large area of flat unforested grassland in south-eastern Europe or Siberia.
....The main way in which domesticating livestock allowed civilizations to spread is that people were freed up to do other things like woodworking and opening shops, since they no longer needed to hunt and gather their food and resources...
The United States has recently experienced the largest influx of mmigrants from South America, more specifically the last biggest influx was from Mexico where a lot of Mexican people started moving in into the US. Another large influx before this one was from Europe, during and before and after World War II.
