Knights were indeed lower than vassals and held less prestige in medieval society. It's not true though, that knights didn't have enough prestige in medieval society. Vassals swore to the king or the ruler of a region, whereas knights often swore to vassals, so they still had people under them, but they were not at the top.
The shang dynasty made many contributions to chinese civilization but four in particular define the dynasty: the invention of writing, the development of a stratified government, the advancement of bronze technology, and the use of the chariot and bronze weapons in warfare.
The President (aka Executive Branch) is responsible for implementing legislation and executive orders. The US Constitution gives the president this power, as Article Two outlines the expectations and rights of the executive branch. This power given to the president can be checked by other branches of the federal government though, as the Supreme Court has the power of judicial review. This means the Supreme Court can rule acts of legislation or executive orders as unconstitutional.
I believe it was 1862 when the transcontinental railroad became part of the Pacific Railroad Act. Right??