The three main issues that led to the creation of third parties during the Antebellum era are (1) slavery, (2) the <span>American system, and (3) people's rights. The Antebellum era pertains to the period in the history of America before the civil war and after the 1812 War. In this period, the country was divided into those who supported slavery and those who want to abolish it. </span>
One advantage that secondary sources have over primary sources for historians would be that "<span>b. They can provide a general summary of evidence other historians have discovered," since this can often be helpful when trying to distill a great deal of information at once. </span>
Encryption is the use of code words or other things such as a different language to transmit data that is able to be understood by only those that use it. An example was during World War II, Americans in the Pacific theater fighting against the Japanese brought Navajo speaking Native Americans to transmit data to other American forces. They did this because the Navajo language was completely unknown to the Japanese and weren't able to decipher the transmissions that they intercept.
Hedeby was attacked by King Harald of Norway in 1050, as part of his conflict with the King of Denmark. After the remains were also sacked and burned down by Slavs in 1066, Hedeby was abandoned. The people from Hedeby consequently moved and founded Schleswig.
This would be B the answer
