How long is a term for a us senator? ?

A term for a US Senator is 6 years long.

Explanation:

The Senate of the United States is one of two chambers in the Federal Congress.  It consists of 100 senators, two from each state. According to the Constitution, the senators' term of office begins at noon on January 3rd of the year after an election and lasts for six years. The Constitution requires that candidates must be at least 30 years old, have been a United States citizen for nine years, and be resident in the state in which they stand for election. There are no limits to how many times senators can be re-elected.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.

answer: in 1900, there were no "workplace safety laws"!

explanation: at the beginning of this century, workers in the united states faced remarkably high health and safety risks on the job.

a century ago in 1900 about three hundred out of every one hundred thousand miners were killed on the job each year.

[industria] developments occurred within a legal and regulatory climate that diminished employer’s interest in safety. as a result, americans developed production methods that were both highly productive and often very dangerous.