is an "earned" benefit for workers who have contributed to the Social Security system.
SSI
is a "needs-based" program that provides assistance to those with limited income and resources, regardless of their work history.
SSI is a needs-based program that requires recipients to reside in the U.S. to ensure they are meeting the needs of vulnerable populations, according to the Social Security Administration.
For a visa from the US my girlfriend had to write a letter of invitation....it was in English. She signed and scanned a copy with her Thai ID with it. Never had an issue on that.
Depends on where you going and where you're staying. If you're staying in the common places that most people like to visit it's very easy to get a ride from one place to another and pull your wheel luggage to wherever you got to go. If you're staying more rural it might be more difficult to drag your luggage and be easier to carry it on your back.