They made teepees because they were nomads. (a nomad is a member of a people having no permanent abode, and who travel from place to place to find fresh pasture for their livestock.) Teepees were easy to set up and put away for traveling purposes. Teepees were made out of stretching buffalo skin over a skeleton of 20-30 wooden poles, all slanted towards a central point and tied together near the top. A flap at the top allowed smoke to escape, and a flap at the bottom served as a doorway.
That fact that the United States allows a certain amount of foreign cheese into the country each year would be an example of an "import quota," since it is setting a limit on the import of a specific product.
It is located in Stillwater, Oklahoma.
The 25th Amendment outlines the rules of succession to the U.S.
Presidency and Vice Presidency in the event of either or both of them
dying, withdrawing or being removed from office.
The modern development of today's world would have first made the routes safer. Today we have the safety of common things such as police officers, hospitals, e.t.c. Transportation of goods would have been easier, and it would have been easier to carry larger amounts of goods at one time.
hope this helps :)