I agree that it is easy to miss the power of immigration.
However it is also easy to miss the power of key laws whose influence is so pervasive that nobody even thinks about them. For instance take Silicon Valley. I firmly believe that one of the reasons that took off in California is that California law says that anything you do on your own time with your own equipment is yours. Period. And no, you can't sign that away.
This makes it extremely difficult to contest an employee who gets a startup going then leaves to further their startup. Which stops legal challenges that otherwise would kill the Silicon Valley startup culture.
I am not a lawyer, but my belief is that Texas law is the same as the default in most of the USA - if you are a professional employee with the wrong contract then work you do on your own time with your own equipment that relates to the skills you are hired for belong to your employee. I personally know people in other states who tried the whole "start a startup, then leave you job for it" thing under regulations like that who were flat out told, "You can quit if you want but everything that you've done for that startup belongs to us." Not a fun situation.
That fact is one of the reasons why I, personally, choose to live in California.
So yes, luck. But yes, state law as well.