Texas secessionists are becoming more fervent than ever. But experts say it would mess up its thriving economy.

• A movement advocating for Texas to secede from the US is gaining attention.
• The movement's de facto leader told BI that Texans are "sick and tired of being crushed."
• Critics argue that secession is impractical, illegal, and bad for business.

A movement calling for Texas to leave the US and become its own country is growing louder.

Daniel Miller, a sixth-generation Texan, is the de facto face of the modern Texas Nationalist Movement, nicknamed "Texit." He advocates for secession through peaceful means, citing frustration with the federal government and a desire for greater autonomy.

"Texans are seeing themselves increasingly disenfranchised by a federal system that is just terminally broken," Miller told Business Insider.