The attack of the twin towers.
Answer:
federation
Explanation:
a group of states with a central government
Ok so when the americans moved west, they built plantations and needed slaves for the plantations. In the east, however, the northern half wanted to free all of them.
Awnser: Humans had been around for tens of thousands of years by the year 1 A.D. when the Earth's population was an estimated 200 million.
