Major in whatever makes the most sense to you, what you want to major in. You can go to MBA school whether a business major or not. MBA schools accept students with all different majors–sciences, social sciences, arts, business. And often students work for a year, a few years, or several years before going back and getting an MBA.
I’d caution against going ED just based on a higher chance of acceptance. It might very well be helpful, so you might want to do it. And it’s great if you have a first choice, and it accepts a much higher % in ED. First, the gap in ED/RD acceptance % can be exaggerated by the fact that lots of recruited athletes, legacies, etc. apply ED and might naturally have an advantage. Second, if you apply ED you won’t have an opportunity to compare offers and different schools. So just think about it. Enhancing your chances at a school like Lehigh might be worth it, given your preferences.
Good recommendations above, given your preferences, basic stats: Southern Methodist, Santa Clara, Richmond, Tulane, Lehigh, Boston College, George Washington, Case Western Reserve University, Georgetown, Wash U, Rice, Tulane, and Emory. The last five would be considered reaches for almost every US student applying. The first ones are also very competitive. It is much harder to give solid advice for internationals, in terms of acceptance. First, there’s less data. Second, I think the international applicant pools can vary more year to year, and a small change in a school’s policy toward international students could easily impact the numbers. For example, a small LAC brings in approximately 50 international students a year and then bumps it to 75, a 50% increase in supply.
With just a little info, it seems like you’d be very competitive at some of these schools. AND if you are really set on coming to the US next year, I’d advise having a quality school that would appear to be an absolute safety . . . Creighton, Bentley, Houston, etc.