Montana became the first state in the U.S. to completely ban TikTok on Wednesday when the state's Republican governor signed a measure that's more sweeping than any other state's attempts to curtail the social media app. The measure is expected to be challenged legally and will serve as a testing ground for the TikTok-free America that many national lawmakers have envisioned. Some lawmakers, the FBI and officials at other agencies are concerned the video-sharing app, owned by the Chinese tech company ByteDance, could be used to allow the Chinese government to access information on American citizens or push pro-Beijing misinformation…