He won because:

- the NDP and the CPC were both led by deeply unpopular leaders: Jagmeet Singh the silk clad, Rolex-wearing self styled "man of the people" and Pierre Poilievre who is so dislikeable he routinely polls double digits below his party

- Trump threatening to collapse the Canadian economy and/or annex us by force

- Flat economic growth

- Carney's credentials on the economy being unparalleled in Canadian politics (see previous point)

- Voters tired of the far-left big government nanny state philosophy that was the hallmark of the Trudeau governments and Carney successfully presented himself as a centrist

Interestingly, Carney was appointed to the Bank of Canada by a Conservative PM and I'd argue he's got a similar appeal that Trump initially had, but for different reasons: Trump positioned himself as an outsider, and Carney is similarly not a career politician. By contrast his only real challenger (Poilievre) hasn't had a real job in his life and has been living on the taxpayer's dime his entire career.

I think voters in both the US and Canada are sick of slimy politicians.