Buy Canadian

No. The impact you'll have on the market as an individual (even if all Canadian or Canadian and US individuals outside the top 5%) will be minimal. The market is primarily guided by mutual funds and commercial investors.

This is, imo, an ineffective way to have an impact on America while it's a highly effective way to impact your own personal well being.

Targeting physical goods by being picky about made-in-canada is going to have a much more significant impact.