qqp question1: I've US B1visa till 31May, 16. I've given I-94 for 6 months entering US. Wanted to travel Mexico. When I'll re-enter U.S, will my I-94 date will change? question2: My wife entered the U.S. on a CR-1 visa after marrying in South Korea. Is it necessary for us to register our marriage in the US?