documemts to prove your legal status in US --- canada don't like you stuck there. canadian visa and related supporting docs.
when leave us, no US officer check you. canadian officer doesn't take your I-94 away. when you return, no canadian officer check you. US officer looks your I-94 first, then other things.
when leave us, no US officer check you. canadian officer doesn't take your I-94 away. when you return, no canadian officer check you. US officer looks your I-94 first, then other things.
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