Manufacturing, production and efficiency had increased through necessity during the Great War. America had emerged as a world industrial leader and the US economy was booming, profits were increasing which led to the period in American history called the Roaring Twenties with a massive rise in consumerism for the wealthy.
I believe the answer is the Andes mountain range
They crossed into North America from Asia to discover more of the region land, grow crops, and learn more about where they were living.
