Basically, I want to use different landing pages for the international audience, but I want to use the same keywords. If I make a new campaign that is geotargeted for say Canada only, can I use the same keywords that I am using in my campaign that geotargets US audiences only?
Yes, and I don't know why more people don't do this - when I'm targeting more than one country I have each country as a separate campaign - gives me more flexibility with the creatives (being able to use US or UK spelling for example) and as you say, with landing pages. Also makes it easier to budget and see what countries perform well.
you can localize the keyword like for example if you've hotel booking website and geo-targetting Canada, you should optimize keywords like "Canada hotel", "hotel in Canada".
yeah you may. but i'll go with magda. i also separate each country in different campaigns so you can play around with it as you optmize.
I'd probably recommend it. If you think the market is big enough, getting the pages and ads translated would be smart as well.