The country being described would be "Spain," since this is the only other country the lies on this peninsula besides Portugal, and Spain was one of the dominant forces in New World conquest.
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.
<span>The answer should be Some African states participated in slave trade to gain more wealth and power. </span>
