Which sentence states the central idea of the passage? You might be surprised to learn that robots have existed for hundreds
of years. Long before the development of modern electronics,
inventors were creating human- or animal-shaped robotic contraptions.
These robots used springs, levers, weights, and clockworks to do
simple tasks. Some of the most famous include a robotic knight
designed by Leonardo da Vinci in 1495 and an artificial duck from
1739 that could swim, flap its wings, and even eat and digest grain.
A. Robots have been around for a long time, but the advances made
in the 21st century are much more significant than those made
earlier
B. Leonardo da Vinci was a pioneer in robotics technology who
created a mechanical knight in 1495.

the discoverers and explorers: 1. natives showed jedediah smith the way. 2. william sublette was the first cross it with a caravan. 3.joel walker and his family were the frist settlers to use it. the jumping off point: 1. founded in 1827 near where the missouri river flows into the mississippi. 2. by the 1840's, it was the most popular "jumping off" point for pioneers to stock their wagons with supplies. 3. missionaries from the church of jesus christ of latter day saints attempted to make independence their zion, or holy capital. the route west: 1. the first emigrants to oregon came by ship before the trail was established. 2. ships continued to to travel to oregon even after the overland migrations began, but they were not popular among the pioneers. 3. the fare for a sea journey to oregon was quite expensive--few pioneer families could afford it. i don't know the other three i'm sorry.

as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.

the anwser is a) to prevent military conflict