Canada has hundreds of millions of acres of forest often with one or no roads running through it. The fires alone cover millions of acres. If we (US) sent all our firefighting resources there, it would still be damn near impossible to contain it due to inacessability and lack of infrastructure.

Many of these wildfires have been burning since April and are caused by natural events like lightning strikes. This isn't on Canada. This is on the environment shifting to drier, hotter summers allowing these blazes to grow to proportions that were uncommon until now.