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How the Schengen 90/180 rule actually works
It's a rolling window, not a calendar reset. How the count works, what EES changed (overstays are automatic now), and why ETIAS isn't something you can apply for yet. Pairs with Sojourn.
How US state residency works when you don't have a home
The 183-day rule is only half the test - it also needs a permanent home you probably don't have. Domicile, the exceptions, and the nine no-income-tax states. Pairs with Sojourn.
What actually triggers California residency
The six-month-safe-harbor myth, the sleeper vehicle-registration rule, and the three clocks that aren't 183 days. Pairs with Latitude.
Registering and insuring a car with no address
Your car is registered and insured to somewhere it has never slept. What a garaging address really means, why renewal fails on the post rather than the rules, and why "full-timer" insurance is an RV product.
One more on the way - planning a long stay without overstaying anything, wherever you're headed. I'm writing them one solid guide at a time rather than posting stubs.