Technology helped navigation for people because back a long time ago sailors had to see the wind and have to actually look and watch for what they were.Now that technology is made you can go to google maps and thats all it takes.
Dust, famine, sickness, unfirtile land, native Americans
Yes.
Although the constitution does not mention the issue of secession, The Supreme Court has consistently interpreted the Constitution to be an "indestructible" union. The states cannot leave the Union. There is no legal basis a state can point to for unilaterally seceding.
For one the bill of rights were before the U.S Constitution, the leaders at the time did not believe that there were enough rights unto the people. Therefore They incorporated the bill of rights into the U.S Constitution to guarantee the protection of the people from the complete control of the Strong Central Government