Technically you can sue any company in the world, but will it get anywhere? When you sue a Canadian company, you pretty much have 1 in a million chance of getting anywhere due to their different legal system, not to mention their justification for lawsuits which are not as "buyer centric" as the US system. Especially when a US company is involved, you have very little pull in the law unless the company is also registered in the US. It is always advisable to come into a settlement than taking the lawsuit route. Not to mention the time and cost involved.
yes
Maybe..
Yes
Yes, it is possible.
Yes, it is a Canadian company.
Yes if they do so using a US court.
The official Canadian Opera Company website has a 'contact us' tab which gives you a list of their locations including the headquarters which is at 145 Queen St, Toronto.
There is no company that mints Canadian coins. The coins are minted by the Canadian government, not a company. The government entity in charge of minting Canadian coins is the Canadian Mint.
I do not believe there is any prohibition against it. If Canadian citizens can (and DO) own property in the US I have every reason to believe that US citizens can own land in Canada.
Canadian Opera Company was created in 1950.
Canadian Stage Company was created in 1987.
The population of Canadian Salt Company is 861.