Two-party system
A two-party system is a party system where two major political parties dominate the government. One of the two parties typically holds a majority in the legislature and is usually referred to as the "majority" or "governing party" while the other is the "minority" or "opposition party". Around the world, the term has different senses. For example, in the United States, Jamaica, and Malta, the sense of "two-party system" describes an arrangement in which all or nearly all elected officials belong to one of the only two major parties, and third parties rarely win any seats in the legislature. In such arrangements, two-party systems are thought to result from various factors like winner-takes-all election rules. In such systems, while chances for third-party candidates winning election to major national office are remote, it is possible for groups within the larger parties, or in opposition to one or both of them, to exert influence on the two major parties. In contrast, in the United Kingdom and Australia and in other parliamentary systems and elsewhere, the term "two-party system" is sometimes used to indicate an arrangement in which two major parties dominate elections but in which there are viable third parties which do win seats in the legislature, and in which the two major parties exert proportionately greater influence than their percentage of votes would suggest.
Federalist No. 67
In modern society, the government, especially the executive branch, has struggled with the ever-growing mixture of republican and energetic governments. The executive branch can be held by two major political parties: the Democrats and the Republicans. The elections that take place every four years, unequal representation within Congress, and differing opinions makes it difficult to find a balance within the Executives. Each new term brings in new faces, who come with new ideas and backgrounds. This rapid exchange of power often leads to a president who tries to do too much in too little of time, which forces a president to be the main problem solver despite having Congress for guidance or intellectual support. This contributes to the overall sense that the president may hold too much power - much like a forceful dictator.