What complex historical causes led to the migration of the puritans and pilgrims to new england

A couple of factors brought the Great Puritan Migration to an end around 1640-1642. These factors were the establishment of the Long Parliament in 1640 and the outbreak of the English Civil War in 1642.

b is correct

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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.