At the end of 2017, California had a GDP of $2.80 trillion and Texas had a GDP of 1.75 trillion.
The US has a GDP of $19.6 trillion at the end of 2017.
In May, 2018, the US GDP is $20 trillion.
California’s GDP is about $2.85 trillion and Texas GDP is $1.8 trillion and NY is about $1.6 trillion.
1. United States $20.0 trillion
2. China 
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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