When did the war change from a battle over preserving the union to a war to end slavery? ? what caused the changed

Explanation:

When Abraham Lincoln was elect in 1860 the southern states raged. Differences between North and South were bigger with that event, because Republicans had a anti-slavery policy.

The main Lincoln's purpose was to unify North and South in a strong Nation, powerful and independent. But, they saw that this goal was impossible to achieve if they don't finished slavery. With that abolishment, North and South had no longer differences.

in 1989, tiananmen square in beijing was the site of china’s main industries. china’s government headquarters. -pro-democracy demonstrations. (second choice)

the committees of correspondence were the american colonies’ means for maintaining communication lines in the years before the revolutionary war. in 1764, boston formed the earliest committee of correspondence to encourage opposition to britain’s stiffening of customs enforcement and prohibition of american paper money. the following year, new york formed a similar committee to keep the other colonies notified of its actions in resisting the stamp act. in 1773, the virginia house of burgesses proposed that each colonial legislature appoint a committee for intercolonial correspondence. the exchanges that followed built solidarity during the turbulent times and bring about the formation of the first continental congress in 1774.