What two political parties have been in power the longest in the history of the united states?

The two major political parties in power today are the Democrats party and Republican party. These two parties have been in power since the 1860s.

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.