What was the era called the middle passage in American history?

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From about 1518 to the mid-19th century, millions of African men, women, and children made the 21-to-90-day voyage aboard grossly overcrowded sailing ships manned by crews mostly from Great Britain, the Netherlands, Portugal, and France.

Explanation:

question:  

the chart compares religious beliefs to us political party support.

religious beliefs and party support, 2012

this chart demonstrates that

a) more highly religious people supported the republican candidate, while more nonreligious people supported the democratic candidate.

b) more highly religious people supported the democratic candidate, while more nonreligious people supported the republican candidate.

c) more moderately religious people supported the republican candidate, while more nonreligious people supported the democratic candidate.

d) more moderately religious people supported the democratic candidate, while more nonreligious people supported the republican candidate.

answer: a.