"<span>Slavery was abolished in the United States" has nothing to do with the Dredd Scott case, which instead said that blacks had no standing in court because they were not citizens. </span>
Psychological warfare involves the planned use of propaganda and other psychological operations to influence the opinions, emotions, attitudes, and behavior of opposition groups. RAND has studied military information support operations (MISO) in many countries and war zones and has provided objective and supportable recommendations to policymakers on methods and tactics to employ or defend against these operations.
This historian would be using the skill of "comparative analysis," since he or she is comparing a wide variety of sources to draw a conclusion between them as a group.
The Inca empire was known for advances that bettered their community and kept balance from within. Some of the things that empires like the Inca used we still may use today.
The Inca had very advanced road systems that they used very frequently. These roads were used primarily for communication and trading goods. Communication, as you can imagine, was very hard back in those days. There was no phone or barely a good mail system, so if someone you knew lived far away, it would be very hard to keep in touch. There were certain message carriers, that would carry messages down these roads to different people.
The Inca also had a very complex government and taxing system. It is very hard to believe that civilizations so far back in time could keep track of things such as government and taxing, even though they didn't keep any written records or anything like we do today. The Inca is known for its complex, advanced, and well done government. This government was called the "<em>Tawantinsuyu</em>" and had numerous people keeping watch over the civilians and how much they paid in taxes, but had one ruler among everyone.
Empires, such as the Inca empire, had to do with many of our advances today and it is astonishing how much they accomplished back in that time.