Electromagnetic Pulse Weapons will be used in the future. This way nothing is destroyed except for electronics. The people are defenseless and the land is simply conquered, the people are imprisoned or quelled and the infrastructure restored. China and/Russia will do it to the powerless jewSA and canuckistan soon.
It's standard design for military equipment to be EMP resistant. Don't worry only the people will suffer the military will still mostly function.
It's probably not a bad idea for us to keep handheld data backups and old "back up phones" in an emp shielding device.
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