The World Alliance refers to an international human organization that served as the protagonists of the series. Their military force, the World Alliance Military, are responsible for the creation of the Fighting Thunder ME-02.
There isn't much known about when the World Alliance was formed, nor its military power was created. The only thing that is known is that they were responsible for creating Raiden mk-II and its blue counterpart. With many Cranassian weapons destroyed, Earth made use of the aliens' technologies, to create new military forces, which used Cranassian-based weapons, thus forming a stronger military power.
- They are likely based on the United Nations, considering that the United Nations is also an international organization with most of Earth's factions as its members.