King George kept MA under martial law and appointed General Thomas Gage as the new governor. He wanted to keep them from acting out against England.
Answer: He was angry at confederacy. Vicksburg was vital to a union victory.
The most useful is documentary evidence. Things people have written. Old newspapers, personal accounts, even things like letters, bank records, govt. records, etc. For fairly recent history there are photographs and even films and videos.
But even writing only goes back about 6000 years. Before that there is archaeological evidence. From studying the debris of ancient civilizations historians can determine what their buildings looked like, what they ate, who they traded with, what they thought was
