Answer:
Frederick Jackson Turner argued that overseas expansion was a "safety valve" to keep ambitious Americans content.
The most economic event was the civil war i hope this helps
Answer:
False
Explanation:
The Olmec civilization was prevalent during the Stone Age, so they mainly used basic materials to make their tools such as stones and wood. Obsidian was not abundant in their area, but it was sometimes available. However, it was not the main material used for their tools.
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