The United States
The Attack on Pearl Harbor marked a surprise military strike perpetrated by the Imperial Japanese Navy Air Service upon the United States attacking the naval base at Pearl Harbor in Honolulu, Hawaii on Sunday morning, December 7, 1941. As a result of this attack, the United States enters into World War II the next day.
<span> B. They were slave states that could have joined the Confederacy.
If the border states had joined the Confederacy, it would have greatly bolstered the population as well as the army of the South. However, if the US was more lenient on the border states and allowed slavery there to a certain degree, the Border states would provide a 'buffer' zone to help protect the North from most attacks, as well as provide men for the army and factories for producing much needed supplies.
hope this helps</span>
This caste system put people at a higher form than others, with the highest on the caste system being able to come back as another high form or ascend. Brainliest please.