Almost 90% of Earth's history occurred during the Precambrian time period
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Imperialism is a political, economic, and cultural domination over other land or territory.
Answer:
The profitability of mining discoveries
A female candidate (Sarah Palin) was running for vice president, but this was not the first time, for example Geraldine Ferraro run for vice president in 1984.
It was significant because It marks the first time a major political party has nominated an African American for its presidential candidate. This candidate also later won and is today's president!