Built a fantastic city in the Andes where stone masons fitted gigantic blocks of stone without help
created a system of picture writing carved in stone
B or c but imma go with state
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.
There are several influences in US government from Greece. The type of government, democracy, comes from Greece. There are also many government buildings in the US that are inspired by Greek government buildings.
Fugitive slave act i believe because of the fact that who ever found a runaway slave would be rewarded.