Why is everyone concerned about the term "blue collar"??? It isn't an insult, it is a category of work. I used that term all the time at work (in HR matters), and there is no dishonour in it!
Ok, so to try and explain again. I asked earlier what sort of worker you were, you replied that you get your hands dirty. In other words you can do the labouring job if needed. So that means that you could get employment as a skilled labourer in road building because you know that.
Could you be a manager? We'll not on your first arrival no. No one will know you, you won't be used to how things work here, such as techniques of road construction or "code" that you have to meet, nor will you know about rules of managing staff, nor will you know how to handle contracts and so on - so no.
Could you set up your own business in road construction on day 1. No. It doesn't matter how much money you have, you need to be licensed in order to obtain the contracts, the insurance, be able to hire workers. You would be fined heavily if you tried to do that unlicensed. Getting a license will take time, and in the mean time you will have American sized bills to pay. The smartest thing you could do to pay those bills is to do the road construction job so you can learn how it is done here, build contacts and so on. So, you will have some time doing blue collar work - nothing wrong with that and a good worker can make good money doing that.
Now then. Is the sort of life and opportunity you can create here worth taking a step back. We'll clearly as Mom explained there are many benefits to being here - it is a place where you can still create a very comfortable life. But you have to be realistic and honest with yourself about what you are leaving. If you live Kenya and are safe, and your kids will be too, then why leave. If there is doubt about that, then the USA can give you a wonderful life and you and your kids will have unlimited opportunity here.