The Federalist Papers consist of eighty-five letters written to newspapers in the late 1780s to urge ratification of the U.S. Constitution. ... Celebrated statesmen Alexander Hamilton, James Madison and John Jay weighed in with a series of essays under the pseudonym “Publius ...
Adding on to the first answer ^^^
Primary sources can also be unreliable as they are biased depending on the source.
If comparing histories of different countries, they tend to describe more victories rather than failures. Also, having a picture as a primary source can be misleading as it can be interpreted in different ways. Sources written in the first person can also have their own biased from the environment the author has lived in.
Their lack of a good trading system. Since they had no Beasts of Burden (Camals) they couldn’t transfer their goods to any trading port.
Another problem was that there rulers after were terrible and did nothing but strengthen the army
Abused powers, unfairly taxed them, and treated them as if they were not a part of Britain anymore
The answer is A. Black sea! hope this helps!