Are these made in the USA?

I never checked. But, I doubt it.

In a car, is the dc ground the same as the dc negative?

DC ground and DC negative, chassis ground, are the same thing, a direct connection to the battery negative terminal. The metal body of the car, frame, sheet metal, engine block etc are all connected together and connected to the negative battery cable .

Need this in a 24v coil version with a flyback diode or resistor preinstalled. link?

Hi, This product is for your reference: https://www.amazon.com/dp/B07L2H67BN?ref=myi_title_dp

Are these suitable for continuous duty?

I use mine for auto radiator fan control, the fan runs continuously in traffic during the summer. No issues.

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Description

⚡ Power up your ride with unstoppable reliability!

QUICK RESPONSE TIME - Fast 7ms operate and 5ms release times for seamless switching
BUILT TO BRAVE THE ELEMENTS - Water-repellent and dustproof casing keeps your relay safe in tough environments
POWER THROUGH WITH CONFIDENCE - Handles up to 40A at 12V DC for robust automotive performance
HEAVY DUTY WIRING FOR RELIABILITY - Equipped with thick 12-gauge wires ensuring secure, long-lasting connections
PRECISION ENGINEERING FOR LONGEVITY - Rated for 100,000 electrical operations and 10 million mechanical cycles

The irhapsody 4-pin 40/30AMP 12V DC Waterproof Relay is a rugged automotive relay designed for high-current switching with a 40A max rating. Featuring a water-repellent and dustproof build, it ensures durability in challenging environments. Heavy-duty 12-gauge wires provide secure connections, while its fast switching times and long operational life make it a dependable choice for professional-grade automotive electrical systems.