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Consider the following headlines:
"Missouri Compromise Allows Two New States into the Union"
"Congress Agrees to Compromise of 1850"
"Popular Sovereighty Adopted Under Kansas-Nebraska Act"

Which issue is reflected in these headlines?
a. The status of slavery in the territories and states
b. The growth of agriculture on the Great Plains
c. The clash of federal and state powers
d. The conflicts with foreign nations over West