Easy!
1. Make laws
2. Keep order
3. Help citizens
4.Protect the country
Elizabeth || is the current Queen of England
The United States took military action against the Taliban due to the attacks on the World Trade Center in 2001 by al Qaeda. Osama bin Laden was determined to have had connections to the movement (however tenuous or extremist they may have been) and the movement itself oftentimes encouraged hostilities against Western states due to their century-long period of interference in Middle Eastern affairs.
I would say that a significant change affecting the natural environment and biodiversity could be the cultivation of corn and beans in mesoamerica which probably required the clearing of some land for the purpose. In populous societies such as the Aztecs the amount of cultivation would have been significant to feed a large population. In more recent times, the buffalo hunt of the First Nations and metis people in what is now Canada as long as it was carried out on a small scale for food and clothing was sustainable but once rifles were introduced and hides were sought and also due to a deliberate policy of extermination by the US military to destroy the independence of the First Nations and force them onto reservations, the bison were almost exterminated. In the 16th century, it was estimated that there were 25-30 million buffalo which is one of the largest populations of mammals recorded in the world. It is believed that the First Nations deliberately burned areas of the Great Plains to foster grasslands for the buffalo feed.
