Question

What kind of voting system normally is most likely to lead to a two-party political system?

Answer 1

The kind of voting system that normally lead to a two-party political system would be proportional representation system. With this system, several members of parliament are to be elected per constituency. Parties are assigned parliamentary seats proportionally to the number of votes they get.

Answer 2

First-past-the-post

Step-by-step explanation:

The single candidate voting method that prevails by far is A first-past-the-post (also called "plural", "relative majority", or "winner takes all"), in which each voter votes on a choice, and the choice that receives the most votes wins, even if it receives less than the majority of votes combined.

This sort of system tends to quickly create favorites and concentrate the options so the votes "won't be lost" during the election by trying to elect a candidate that is less known (many candidates are prematurely dropped for the perceived notion of "not-standing-a-change" against bigger parties).