Asap explain why tension over slavery caused conflict in america in the mid-1800s (paragraph format)

America expanding westward, & the abolishment movement created tension of the use of slavery. Many southerners believed that slavery should be allowed, while Northerners began to question the need for slaves. The tension resulted in the Civil War, and by the end, 4 million slaves had been freed from slavery.

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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the space race was a battle to make advanced technology to get to the moon and to get a better understanding of space.