Can someone explain me about house price and mortgage and interest rate in United States?

I am from Canada and since Covid, house prices are skyrocketing. In 2018, house is 300K and now 650-700K. Average 1800sq/2 700-750K (this is in small city) depends on location.
I am an architect and generally know most cost of house but still does not make sense 700K. What is the situation in US?
I have seen lots of 3000 sq/2 house in Texas around 250-300K. How the fuck is that possible?
Average property tax around 5-6K/anually here. Is that a big deal in US?
Updates
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Can you guys mention your propert/ real estate taxes? How does that calculate? Base on property value or kind of municipal percentage? Does it worth to move US. That’s why all I am looking into.
Can someone explain me about house price and mortgage and interest rate in United States?
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