Political Bosses were the leaders of the political machines, they grew wealthy because they assigned government contracts asking for favors like votes or promoting campaign on their favor, they also controlled financing of campaigns to later ask for recompense. By doing this they reached position in the local government of cities, counties and states and this way concentrated wealth around corruption.
The reasons are that Rehoboam attempted to continue his father, Solomon's unwise policy of swinging taxes and then arrogantly increased them when the Israelites complained. In a very short time, the Israelites rebelled and split from Israel, forming their own kingdom called Israel.
The Bill of Rights contains the first ten amendments to the US Constitution.