People became refugee in their own country because if one part of a country lacks something or attacked by a natural disaster or attacked by other country, then people move to other places,but within...
People used to travel on ships called frigates.The trip was long and exhausting. Just going from The East Coast to Europe took about four to five months!
a country becomes a country when it marks where its territory is going to be and calls it "theirs" for example "from this border to this border is the new faboam(example) nation"