I'm under H1B, and my company is processing to sponsor my green card petition. The company wants me to attend a conference in Canada. My last entry visa with H1B to the US was about 2 years ago. I have a few questions:
1. Do I have to apply for a visitor visa to Canada?
2. Do I have to apply for a new entry visa to the US when I come back? If so, will I have some troubles to come back caused by my green card petition? If it'd be an obvious risk to travel oversea, I'd definetly be not going.
Thanks for your time for looking and answering the questions.
