So, did you guys know that currently for at least 5 hours, potentially since February 1st, there's been a Chinese Spy Balloon hovering over Montana?

Did you also know the Pentagon refuses to shoot it down because its "not safe" to?

Its 3 busses wide, and has a technology bay.

This begs the question, how did a spy balloon get into our airspace unnoticed, and why wasn't it shot down immediately? Wouldn't this also be considered an act of war? (Genuinely asking the last one)