You should probably work and worry about matching a residency in the US before even contemplating your ultimate career in cardiology. You need to actually spend time working with and teaching residents before making grand plans.
Your other post in the IMG thread about aiming for UTSW gives me a clue that you may not have a good handle on what you are or aren’t competitive for (especially with zero research).
Please don't be mad at me, I know that I ignore many facts, and I apologize if I said something inappropriate, or if I used inadequate ways to express what I have in my mind.
I just like to follow what Benjamin Franklin and Winston Churchill said; “By failing to prepare, you are preparing to fail” and “He who fails to plan is planning to fail”, respectively.
I am aware that many of my plans might not work out how I'm expected to be, or that I may be wrong regarding with what I have in my mind right now, or that something might not even be what I expected to be like, etc; but making mistakes and changing paths is all part of human beings, and asking silly questions can sometimes be a good way to learn, I think.
And about the research issue though, unfortunately, there are no significant research opportunities in my country, we are never taught to do research in most of our medical schools, and my parents didn't have enough money to pay me for some research electives or something else. Right now I'm trying to get some loans and funding in order to move into a 3-people department in the US or even a cheaper option if possible, while being on b1b2 visa, and see if I get to find an IMG-friendly mentor for a clinical research volunteering. Then I'll start paying all my debt off once I get to match into a program.
I do respect your thoughts bro, and again, I apologize for any type of inappropriate behavior that I could've had or any bad comment that I could've made.
I wish the very best to all of you guys!!