Missouri leads in joining Texas. Other states are... Missouri, Alabama, Arkansas, Florida, Indiana, Kansas, Louisiana, Mississippi, Montana, Nebraska, North Dakota, Oklahoma, South Carolina, South Dakota, Tennessee, Utah, and West Virginia. http://www.supremecourt.gov/DocketPDF/22/22O155/163215/20201209144840609_2020-12-09%20-%20Texas%20v.%20Pennsylvania%20-%20Amicus%20Brief%20of%20Missouri%20et%20al.%20-%20Final%20with%20Tables.pdf