In a democratic political environment, it is obvious that political parties can be established by any individual or groups in as much as they met the requirement to create such political party in the country.
The "major" political parties are parties which have the highest popularity and members over other minor parties counterparts.
In United state, the major political party is the Democratic Party and the Republican Party.
Therefore, the most important factor in determining how many major political parties a country has is the rank of the party popularity and membership in comparison to other parties.
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