It's reasonable to think the nations with the most Christians will be most adversely affected by the rapture, e.g. nations like North Korea, Iran, and Afghanistan will be least affected by the rapture.
It is also reasonable to think God's "hedge of protection" will be removed from the US after the rapture.
In the post rapture world, North Korea will have nothing to lose by nuking greater Los Angeles and San Francisco Bay region including Silicon Valley and Sacramento.
The rapture will occur in a moment when the people do not anticipate. California's future and all of America's urban zones is very bleak. Urban Americans do not have natural access to potable water or food producing land.