I think they had in common to develope their populations and "cities" (at their time there aren't real city like nowadays) near the rivers. Also both they had access to good fertile soils
In 1862 the Pacific Railway Act was approved by Congress, encouraging the construction of a transcontinental railroad. Some of these railroads were built with assistance from the Federal Government.
The patient received a new trachea, or windpipe, made from his own stem cells<span>. An international team of surgeons successfully carried out the world's first </span>transplant<span> of a synthetic </span>windpipe<span>.</span>
The City Commission is the answer
democracy, where everyone elects a leader
