Dear Aspirant,

Getting a job in US or UK after an M.S from canada is possible but there are many factors to be considered beforehand to come to a conclusion

some of them are like:

• Research field you pick in your M.S (The reputation or the need of the domain you were working for next 3 years in real life plays a crucial role to calculate the possibility of you getting a job in US or UK)
• University you join for your MS (actually college tag doesn't matter in abroad as in India the only thing matters is your skill but either ways opportunities knocking on your way depends on the college you are in )
• Companies you knock for your placement (Try applying for open positions available in UK or US via career pages of different companies available there online and also try sitting for US or UK based company placements getting on your way at your university in Canada)
• If you were studying in Computer Science or Electronics companies like google, Facebook, microsoft and so on... make sure all the positions they have across the world are displayed on there careers page which are open for anyone to apply so give it a try.

Hope this helps you out
All the best