The scientific revolution led drastic changes in the way the world was conceived and how humans ordered their universe and understood the world around them.
Most immigrants left their homes due to economic reasons. Moving to the big city usually definetely got you a job and in some cases they got to start buisnesses.
The earliest people to settle in Meso-America are the Olmec. The Olmec had a rich society and traded with neighboring tribes such as the Mokaya which were a civilization of the Soconusco region.