I think it's the telephone because it allows people to communicate better and customers or workers don't have to walk up to everyone and disturb them. You may elaborate more on this with your own opinion
Answer:
During the Civil War , federal powers expand to include an income tax and a national currency.
I would guess the Mediterranean Sea.
Answer:
The Greek democracy established in Athens was direct rather than representative: any male citizen over the age of 20 could and was required to participate. The officials of the democracy were elected in part by the Assembly and in large part by lottery in a process known as sortition.
Explanation: