- A system of leaders who carry out the work of the government through the use of department, in which one person has control over all branches of the government.
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Tuesday voting is a law from 1845, when people coun't travel on Sundays for religious reasons, so they needed a monday to have time to travel to the place where the vote took place.
The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
I believe that it is the first one about tribes
