| A | B |
|---|
| reservoir | a lake used for collecting and storing water |
| decade | length of time that is 10 years |
| century | length of time that is 100 years |
| transportation | ways of moving thigs from one place to another |
| disaster | something that happens that causes great harm to a community |
| lodge | a home made of logs, earth, and grass |
| tepee | an easily moved shelter, made of poles covered with buffalo skins |
| legends | stories that explain how things came to be |
| canals | waterways that are built by people |
| causeways | roads that are built on soil piled up in shallow water |
| empire | land and people under the control of a powerful nation |
| artifacts | objects that we find that were used by people in the past |
| archaeologists | scientists who look for artifacts and explain how they were used |
| pollution | anything that makes the air, land, or water unclean |
| solutions | ways to solve problems |
| slave | a person who is owned by another person and works without pay |
| colony | a settlement that is ruled by another country |
| tax | money paid to the government to run a city, state, or country |
| revolution | a fight for a change in government |
| independence | freedom from the rules of others |
| constitution | a plan of government |
| civil war | a war in which two parts of one country fight each other |
| amendment | a change made to something that is already written |
| communication | sharing of feelings, thoughts and information |
| transcontinental | something that goes from one side of a continent to the other |
| invention | something that has been made for the first time |
| suburbs | communities that are built near cities |
| satellite | a spacecraft that is used to send radio, telephone, and television signals |
| historical society | a group of people, usually volunteers, who have a special interest in the history of their community |
