If you were being paid to destroy the US this is what it would look like, immigrants built most of the US.

Skilled immigrants being important to the country and the H1B visa program being abused by large employers can both be true at the same time. From my own personal experience, most H1B visa holders are competent but not uniquely skilled.

This would be stupid five or ten years ago. Right now however, we have enough tech people in the country for the current job market.

On the other hand, immigrants are the ones you can exploit the most and use against your own citizens. They are throwing away a resource they still need.

But I guess with enough coercive force, it just might work with your own populus too.

No, destroying the US is what the rampant guest worker abuse is doing.

European settlers most of which from a tiny circle on the globe, and then we've had periods of immigration moratorium where our prosperity was dominated by domestic population. There's no law of the universe that says all immigrants are fungible.

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Were they immigrants or colonisers? It changes from week to week.

The American founders were almost all British settlers. You can’t compare settlers building a new society according to their own culture to immigrants coming to an existing society someone else built.