Name three indigenous civilizations that were decentralized (had no strong central government to unify them)

The Olmec, The Tarascan, The Mexica

Explanation:

The Olmec, The Toltec, The Mexica are three indigenous civilizations of America from the Pre-Columbian era.

The Olmec civilization initiated the cultural blueprint that was followed by other indigenous civilizations in Mexico. The Olmec influence was spread across Mexico, along the Gulf of Mexico and into Central America. Olmec civilization was involved in pottery.

The Tarascan civilization was ruled by several independent communities. The first Cazonci, Tariacuri, united communities that contributed to the advancement of civilizations in Mesoamerica.

The Mexica civilization thinks of themselves as heirs of the civilizations. Their former inhabitants were the Toltecs and gave them a legacy of arts, engraving, sculpture, architecture, the calendar, and feather-mosaic work.

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explanation:

the us constitution is a living document, meaning that it can be changed over time as the country changes.