About the English language proficiency: I did both my undergraduate and graduate schooling from US. Even with theese, the Canadian immigration sent me a letter stating I need to prove my english language proficiency. I wrote them back stating I did my colleges in US. All the courses were taught in English. I also sent a copy of my old TOEFL score. The TOEFL score was from 1992 and my Canadian immigration process was done in 2006/ 2007. So to answer your question: NO, you don't need to take any proficiency test if you have US college degree. I hope this helps.

Cheers