I have not seen it but it sounds like the movie Green Card. Is that right?
Ironically, I have never seen the mover Green Card. However, this is the latest craze in the reality TV world alongside the 1,000 lb sisters. People in the US fall in love with people from other countries, and they get them here in the US and work on getting married. In some cases, they actually stay in that other person's country. It is interesting to learn about other cultures and the culture shock. 
Okay, I have to ask. . . why would they want to marry in the US and stay in another country?
Sometimes for culture reasons. For example, one guy could have more than one wife in his home country. His parents would also not approve until the US person came to their culture and did a traditional marriage as well. 
So I wonder about who would want to be a second or third wife, but I do know it exists in some cultures. Are the people partaking in the show pretty average middle class?
It would surprise you the people that partake in this. You actually see different social and economic groups. For example, one lady lived in a hut in Ecuador, I believe. He was totally freaking out when he had to go stay there for a while. Big Ed, which I do recommend just searching him, if this does peak your interest of course. He did class with his fiance because he was of very high class and she was not in her home country. He would often even make sanitary remarks, but he did not understand how much that hurt her because her culture. There are also some really great stories too though.  
From what I see there are also some divorces. Is that part of the follow up stories?
Yes, absolutely. So much so that they now also have 90 day single life. This is even more of a hit. You also see the married couples tuning in for each episode discussing called 90 day pillow talk. 
Wow this sounds like another "Law and Order" with tons of spinoffs. Is Big Ed your favorite character. I am trying to look him up. He doesn't sound nice from your description.
He was an interesting character, but his wives and his US gf on the single life were both younger than his daughter. Someone has also come to light to accuse him of some not so pretty things as well. 
I am trying to wrap my head around this show and read that it is difficult to explain to people. TLC does have some crazy as well as popular shows. Who would have that the Little People would be a hit?
That is very true. That reminds me of Little Women from different cities that was on Lifetime, like they had one for ATL. One of the ladies from the ATL one did pass away recently.  
Oh, I was not aware. It seems that 90 day Finance may strike a chord with a wider audience.
It is actually pretty popular and thriving at least so it seems, but I do see where it can strike some cords. I would say it more so strikes cords to the families going through it. Outside we tell ourselves that is crazy, etc, but what would happen if we were also in those positions
I love traveling to experience different cultures but this would be extreme. Do you watch once a week?
To do so for traveling, yes. I do know some meeting their SO while traveling as well. I do not watch this once a week. Sometimes it is every other week, just depends on how busy the week is.