I moved to the US from the UK for my husband's job. I loved the place (Austin, TX) but ultimately became very isolated and depressed and insisted on moving home before we started a family. A few things to consider:
Wages are better and standard of living generally higher.
School shootings happen way more often than you'd imagine. Active shooter drills are a thing in schools.
Healthcare is much better than UK but expensive (even with insurance).
Do you have any sort of support network out there? Raising kids without friends/family around is really not fun.
If things go wrong, child custody laws are different to the UK and vary by state - make sure you know what you're getting yourself into, just incase.
Will you be able to work? Do you want to work? I felt extremely isolated without any financial independence, even though hubby earned enough for both of us. It made me miserable not even being allowed to pick up a weekend shift or volunteer.
Can you drive? The US is not pedestrian friendly, depending where you are of course, but generally it's very difficult to get around without a car, even in urban areas.
I know it's English speaking but expect a culture shock when you move. I got so frustrated with feeling like a fish out of water and it really impacted my confidence. I was not prepared for it at all! We get exposed to a lot of American culture/language through TV etc, but not so much the other way around - the minute I spoke with a British accent, people treated me like an alien. And genuinely, they didn't understand what I was talking about the majority of the time. It made it very difficult to ever feel settled.
Ultimately, it was a cool place and a lot of fun for a few years, but I desperately wanted to come home in the end. No way would I want to have children out there. And I'l s ay this - I'd bloody hate to be poor in America!