Coalition refers to alliances that include more than 2 parties, and that are conceived from the need to achieve certain objectives together. These unions are quite common in the political sphere, when two or more parties, generally that profess the same ideologies or beliefs, pretend to agree, in order to share power and govern the country peacefully. The electoral collations, for their part, focus on the union of two political awnings, before or after the elections, to have a greater scope in the voting; This also provides a single candidacy and shows voters that collective improvement desires can be grouped around only one representative.
Coalitions have been around since ancient times. Generally, this measure was adopted when the management of a King was not very good or if his popularity was very low. With this the Leagues of noble families were born, which maintained an important control over the nations located in Central Europe. In contemporary times, recurring examples of coalitions are those formed by some European powers, in view of the rise of the French Revolution. During this period, around 7 coalitions were formed, the last one ending with the defeat and subsequent flight of Napoleon Bonaparte.
Today, coalitions are still popular in Europe; they occur in political environments where more than two major parties predominate, leaving alternative parties with the option of joining them or trying to increase their popularity. Similarly, it can be presented when a political group does not have sufficient support from the legislative power, such as the congress or the senate, so the deputies must vote supporting the decisions of the majority group.