An employer in the US is bound by US laws on whether the OP is an employee or contractor, no matter where the OP is. (If the OP was defined as an employee then many laws like the ADA would not apply to them, assuming they never travelled to the US office, but Canadian employment laws would, like required notice periods - it's a very complex setup and many employers just won't do it, some smaller companies do it without actually understanding what they're doing.)
Comments
It sounds like the OP is not in the US.
No, but they are specifically asking about the US.
They specifically asked about working in Canada:
An employer in the US is bound by US laws on whether the OP is an employee or contractor, no matter where the OP is. (If the OP was defined as an employee then many laws like the ADA would not apply to them, assuming they never travelled to the US office, but Canadian employment laws would, like required notice periods - it's a very complex setup and many employers just won't do it, some smaller companies do it without actually understanding what they're doing.)