You need to apply and be admitted. As for whether a school will accept your grades from your first year of college, that is something you will have to check with, regarding the particular college. Standards differ.
I realize you are asking generically and are really just hoping for an answer as to whether Ethiopian credits will transfer. But, like I said, universities have differing requirements and may not all accept your credits, even in part.
The good news is, you only have to go to one school.
So, I repeat, you need to become considerably
more focused on where you want to go to college, either in the US or the UK, and then concentrate on the acceptance policy of the ten (or twenty, or three, or whatever) schools where you most wish to go to school.