In the mid-nineteenth century, a major pull factor in US interregional migration was the building of the Erie Canal.

the cold climate in the East.

the Gold Rush in the West.

the expansion of the railroads.

the overcrowding in the East.

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The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun.