As has been said many times, number of confirmed cases just means more positive tests. It is not meaningful without other information, including how many tests have been done. With Texas, they have dramatically increased the number of tests done in the past week. That is a logical reason for increased confirmed cases.
Clicking on a state here can give you some details:
https://covidtracking.com/data
Texas seems to have about a 5% rate of positives from their tests; that means 95% negative. That percentage may be slightly increased from a month ago, but is a rate where if every state was there, the country would be in pretty good shape.
For comparison, just yesterday, New Jersey had 20% of its tests as positive. This is greatly decreased, but I'm not sure NJ ever had a day where they returned 5% or less positives.