+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
Same as having any other country passport or PR card which is none. How would a Canadian PR card help you in the US? You would have rights in Canada such as travelling to Canada without a visa, right to move to Canada, right to work in Canada, that's about it.
 
You draw benefits through (NAFTA) North American Free Trade Agreement between Canada,United States & Maxico.

This agreement :-

a) eliminates barriers to trade in, and facilitate the cross-border movement of, goods and services between the territories of the Parties; (Canada,USA,Maxico)

b) promotes conditions of fair competition in the free trade area;

c) increases substantial investment opportunities in the territories of the Parties;

d) provides adequate and effective protection and enforcement of intellectual property rights in each Party's territory;