Answer:
Slave laber was no longer an option to help their economy
Explanation:
The Civil War was between the Northern and the Southern states over slavery, the North won and the Emancipation Proclaimation set all the slaves free
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The main similarities between the Chavin people and the Incas are in the religion, polytheistic with resemblance of gods and rituals. In addition, economic models resemble each other, such as the use of maize as an important "exchange currency". The structure of government is also the same, since they both operated in a theocracy. They occupied the same geographical area too.
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So if the vice president (president of the Senate) isn’t present, the president pro tempore (senator who’s been there the longest from the majority party) will take over.