There are 2 crops that are always genetically modified unless they are organic. These are corn and soy. 

I grew up in Canda where there are more farms than cities. We lived in a small village surrounded by farms. There were fields of all kinds of vegetables and some fields for berries everywhere when I was living with my parents in the 1960s. Now when I go back to visit my family all I see are corn and soy fields with little signs on the side of the road that have identifying numbers which identify the crop as GMO. 

There have been many arguments against or supporting GMO and many consumers are confused as to whether they should be concerned or not. 

One thing is for certain, it has created a problem for farmers who don’t want to grow GMO crops because there is cross contamination between fields. It forces the farmer to try and build barriers between fields which makes them lose land that could be used for growing crops. They have difficulty finding non-GMO seeds. They often find that their crop has been contaminated despite their best efforts which then prevents them from selling their product as organic.