"First Past The post voting artificially limits the number of political parties to two. "
Kiiiind of, Canada has fptp as well and we have about 4.5ish competitive parties, Liberal Party, Conservative Party, NDP (“socialist” party), Bloc Quebecois (Quebec focussed party [used to be a sepratist party, but has evolved to just focus on getting more favourable policies for Quebec since separating has fallen out of favour in Quebec), and the .5 would be the Green Party. So we can vote against the main 2 without wasting our votes/effectively voting for the party we hate more. BUT the reason I said kinda is notice I said Main 2. NDP has won opposition a few times (2nd most voted for party nationally), but Only 2 parties have ever been the most voted for in an election, the Liberals and the Conservatives. (Bloc Quebecois has won the provincial government multiple times in Quebec, but obviously has never been a contender for national government)
(Green is .5 because most people know about them, but to my knowledge they have never won even a provincial government, which the other 4 all have multiple times)
Once again, NDP has won Opposition before (which to those unfamiliar, means that it held more legislative power than all other parties aside from the one that won the election). It is a viable 3rd option and likely would have won the national election roughly a decade ago if Jack Layton hadnt died of cancer during his run.
And because of how our legislature works, if the winning party wins by a minority (Less than 50% of legislative seats), the NDP can team up with the opposition to outpower the party that won and use that to attempt to get legislation that it wants pushed through as a compromise.
TL:DR your last paragraph is false and only serves to entrench the 2 most powerful parties. Canadian 3rd parties are VASTLY more viable than American ones