During the period 1820–1860, the major concerns in the united states dealt with issues related to
a. determining the future of slavery.
b. increasing public funding of political campaigns.
c. decreasing the number of elective offices.
d. decreasing voter registration drives.

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It can the reader to have a broader understanding of the point or main idea of a passage/essay. if you use words with similar meanings throughout a written work, it can show the reader that the words reflect the key idea of a passage. this can really you to understand what is going on, and reflect on some key ideas and phrases that were mentioned in said written work.i hope this !

(the column on the right side has numbers 1-4 as well)

from left column to the right marching definition column:
1=2
2=4
3=1
4=3