Manifest Destiny basically mean, "EVERYONE MOVE TO THE WEST NOW!" But with no slaves, how would they create farms to maintain themselves? Easy: expand slavery. However, this was battled against by several sources to create the Compromise of 1850. The compromise delayed the Civil War, despite politicians knowing it will eventually happen. It bought them time-- that was important! Other new states like Nebraska and Kansas were allowed to allow slavery or not. This eventually grew to where the North had no slavery and the South did, which lead to the Civil War.
Answer: Soviet leaders replaced reform - minded Czech officials. Those who had taken part in the democratic reforms of the Prague Spring were removed from the KSC. Dubcek was expelled from the KSC and demoted to an unimportant position in the forestry service.
