@Elena3238 have you been to all 3 cities? What did you think?
As a host, people are paying for you to know the area well enough to make recommendations to them. If you are paying someone else to do this and just hoping to profit, I would probably invest in something else. There is so much risk involved in owning a property internationally, let alone one which is somewhere you are unfamiliar with.
Memphis, Oklahoma City and Milwaukee are about as different as you can get from one another. Do you know the history of any of the cities? Major industries? Weather? Are you familiar with local issues and politics? Investing in a city in the US for ABB will require you to be very well versed in what the politicians and residents think about allowing short term rental. Its not merely a question of "is this neighborhood nice?" If it is, and ABB is allowed you can bet there will be competition. There may be a need for licenses, getting to know neighbors (some places require neighbors to sign off to allow you to operate, or require you to be on site.) You need to know about seasonal shifts in tourism, local attractions, taxes, laws, insurance, home owners associations, flood planes, etc.
I don't mean to be discouraging, but this line of questioning reveals a very uninformed outlook. You need to do some boots on the ground research and not just ask a bunch of other hosts. Its too big a financial commitment to trust to the lot of us.