The US is basically a single market for goods and labor. Individual banks have branches all over the country. It's one currency. There's one federal set of tra

The US is basically a single market for goods and labor. Individual banks have branches all over the country. It's one currency. There's one federal set of trade laws with minor state limits on some goods. Shipping goods across state lines or selling digital wares across state lines are covered mostly by federal law. Contracts may or may not, by their own language, invoke state laws in interstate sales with few exceptions (some states don't allow a seller to waive certain of a buyer's rights in a standard sales contract). There's no government interference moving from one state to another for work (unless you're a felon or a sex offender or some other special case). There's one set of immigration laws. There's one set of passport requirements. Yes, you could say each state is its own market. But then you could say the same about each city and town. For some people individual cities in the US compete directly against one another more than state vs. state. Am I likely to find work in my field in any little farm town in northern California, upstate New York, rural Georgia, Texas hill country or scrub desert, or in downstate Illinois? Not at all. In San Francisco and the Valley? In NYC? In Chicago? Houston? Dallas? Austin? LA? Atlanta? Sure.