What was the importance of the truman doctrine?
a. it sought to contain the spread of communism.
b. it strengthen relations between the united states and china.
c. it allowed the soviet union to develop nuclear weapons.
d. it prohibited all countries from expanding their nuclear weapons.

it sought to contain the spread of communism.

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.