No idea what primary research so i'm going to assume you mean primary source in which case it depends on the type of evidence, like if it's a personal account then that's a primary source but if it's someone telling of someone else's story it's not.
Answer:
In 1670, there was not a country called the United States of America, but there was only a collection of British colonies which weren´t free; they were under the authority of England´s crown. In 1860, the USA was a well established independent and democratic country, despite the deep political and social divisions of the time that would lead to the Civil War. The nation had its Constitution, citizens´rights (it is true not all people could enjoy them because of slavery) and separation of powers. There were regular elections for president and Congress. Unfortunately, the democratic progress of the USA did not benefit all on an equal basis in the 19th century and good part of the 20th century. Even after the Civil War, the passing of the 14th Amendment and other laws, real legal equality was not achieved. Southern states approved legislation that impeded the effective use of African American rights to vote. So, democratic evolution hasn´t always generated benefits to all, but there´s been significant improvement since the 1960s.
Explanation:
The answer is B, usually history is passed through oral ( mouth to mouth ) so it’s not totally accurate but written records shows proof of civilization. Hope this helps!
Applied principles of physics to make practical inventions
Answer:
idk man you need to provide examples as image
