DEFINITION of National Emergency with history thereof, list of current active ones (preTrump) - they are very different than you may think, many of them are trade sanctions with troubled nations.
ImO the border situation clearly qualifies and matches all the others, with the sole exception that most of the crises are in other countries with us assuming peacekeeping or statecraft role,whereas the border is actual an American crisis.
https://fas.org/sgp/crs/natsec/98-505.pdf