All of these States have joined TX in the legal battle against Biden admin.

The dark red States agreed to join using State defense Force / Guard units

The States may or may not send troops to border. Their mission might be in their own State but it is in support of the invasion.

https://governor.alabama.gov/assets/2022/04/Joint-MOU-forming-the-American-Governors-Border-Strike-Force-4.19.2022.pdf

Some of the States that pledged Guard forces others joined later

https://gov.texas.gov/news/post/operation-lone-star-gains-national-support-from-state-governors#:~:text=As%20of%20this%20week%2C%2014,border%20in%20President%20Biden's%20absence.