What was the name of the region / land where people ended up resting after their death after the arrival of Columbus?

The Aztecs, who probably originated as a nomadic tribe in northern Mexico, arrived in Mesoamerica around the beginning of the 13th century. From their magnificent capital city, Tenochtitlan, the Aztecs emerged as the dominant force in central Mexico, developing an intricate social, political, religious and commercial organization that brought many of the region’s city-states under their control by the 15th century. Invaders led by the Spanish conquistador Hernán Cortés overthrew the Aztec Empire by force and captured Tenochtitlan in 1521, bringing an end to Mesoamerica’s last great native civilization.

Explanation:

The mRNA transcript that is produced in the nucleus is in immature form, it had to get matured, and then its capping and tailing is done. 5' cap is added and a poly A tail is added at 3' end of this mRNA. This helps it to get matured. moreover for its maturation the non-coding regions (introns) are removed and exons are packed up again to form a mature mRNA.

This mature mRNA then proceeds to its way to the ribosomes for translation of proteins.