Answer:
1) large population centers; (2) monumental architecture and unique art styles; (3) shared communication strategies; (4) systems for administering territories; (5) a complex division of labor; and (6) the division of people into social and economic classes.
Source: Key Components of Civilization - National Geographic Society
The invention of the telegraph and telephone helped improve the standard in the United States by making the lives of the citizens more easier and efficient. The telegraph was a machine that send messages to places from long distances. The telephone is a machine that transmits sound to another device. The telegraph and telephone helped improve the living standards by helping people send messages and audio to places from long distances, so the person doesn't have to send a letter that could take days for the person to receive. It made the lives of the people in the United States a lot easier.
A solution composed of α-cyclodextrine, waterand 4-methylpyridine hope this helped
