I’d look for a change in slope. A permanent change that adversely affected tourism would decrease the slope, but maybe not so much as to make it negative.

https://ourworldindata.org/grapher/international-tourist-tri...

Between 1995 and 2015 (capturing data before and after 2001) the US's change in tourism increased at a faster rate than France, Italy, Greece, Germany, Austria, and the UK. Spain may have increased at a slightly faster pace, but it's close.