In political systems where there can be only 1 winner of an election, 2 parties emerge that dominate the system. Usually one more right-wing and one more left-wing.
Because of the lack of real choice people end up not voting for the party they want, but rather against the party they hate.
Since only 1 of those 2 parties has any real chance of winning, other minor parties become effectively politically irrelevant and ultimately only take away votes from the larger parties when they become unpopular.
This effect isn’t nearly enough to get the minor parties elected, but it is enough to prevent the major party from losing.
In the US they call this ‘the two party system’
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