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Canada wants permanent immigrants, not temporary workers, and makes it harder to hire foreign workers by requiring companies to apply for LMIA that takes months to be approved, if approved. The US (and most other countries) wants the opposite, and as soon as you are no longer necessary they kick you out. This gives visa holders a disadvantage related to other workers in the same industry since they are tied to an employer and can't just quit. In fact, they are at a mercy of the employer and are likely to work harder for a lower salary. Yeah, their average pay is higher than the country average, but it is still lower than other workers with the same skills.