<span><span>The expansion of railroads caused Native Americans to be displaced from their tribal land. </span></span>
The Ancient Greek golden age<span> occurs under the leadership of Pericles in the 5th century BCE. These achievements were mainly confined to the city-state of Athens, where a strong economy and good government created the conditions necessary for such advancements.</span>
The United States is one of five permanent members of the United Nations b) security council. The other member states are: Russia, France, China and the United Kingdom. The Security Council is one of the six principal organs of the United Nations and is charged with the maintenance of international peace and security, as well as accepting new members into the United Nations and approving any changes to the United Nations charter.
