US surveillance isn't limited to the US; the NSA spies on everything, its just that it's spying within the US is controversial given that it's legal mission is foreign signals intelligence, and the US has statutory and Constitutional limits on domestic government surveillance which are arguably violated by the NSA's domestic surveillance. NSA engaging in universal and total foreign surveillance is far less controversial in the US, but it would be a mistake to conflate the lack of controversy with a lack of NSA activity.