PLEASE HELP Describe the geologic setting of Cascadia, located in the Pacific Northwest.
Cascadia is located right near a subduction zone, which is where a pate slides underneath another plate when they end up colliding.

I don’t understand

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

I’m confused ///: : : :