That is categorically false, and testifes to some sort of deep seated bias against our own country profoundly embedded in your worldview -- one which extends all the way to glib counterfactual promotion of verifiably false information about the country and its supposed moral shortcomings.
2) Texas has a much larger population than 49 of the other 50 states -- about 30 million, higher than any state but California. Of course the number of uninsured residents will be higher than the national average. You didn't control for uninsured per capita.
Why are so many uninsured if it's possible (I didn't say easy) for them to get coverage? Probably, a large part of the reason is people who go around promoting the (completely false) common trope that "poor Americans just can't get health coverage, the government does nothing for them."