what arguments did Abraham Lincoln use against the secession of the southern states? Select two that apply.

a. Secession would need to be approved through popular sovereignty.
b. The government was a union of people, not states.
c. The southern states lacked the power to secede under the constitution.
d. Slavery was a system that would eventually bankrupt the southern states.

b. The government was a union of people, not states.

c. The southern states lacked the power to secede under the constitution.