D The industrial revolution
Throughout America, the number of participants in choirs has increased where more than 42.6 million individuals (both adults and children combined) are now considered to be part of some choral group.
There are more than 270,000 choral groups all across America (in 2009, as per the study). This participation is far more than any other performing arts.
1 in 6 Americans (above 18) sings in a chorus.
In 2009, the percentage has increased from 14% to 17%.
This information is taken from The Chorus Impact Study of 2009 which can be referred to for further details on Choral Singing and its impact on American life.
The study also examines the effect of choral singing on children and their development along with many other social aspects.
brainly.com/question/17640146
The main issue that was debated by Lincoln and Douglas was slavery.
Answer:
A, C, and D .
Explanation:
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In the United States, the only reason slavery was abolished was the Civil War, since up to this conflict the Southern states had refused to limit their ability to use slaves for labor. This led to a major division within society--since the almost the entirely of the population in the North was opposed to slavery.