Active US emergency declarations deal mostly with international situations

There are 31 active national emergencies. Most respond to a foreign or transnational crisis. If Trump declares a national emergency to build a border wall, it would be a departure from previous declarations.

Source: The World reporting
In the above chart, domestic crises refer to direct threats on Americans or US soil; transnational crises refer to broad international security threats; and foreign crises refer to situations in specific countries or regions.

Indra Ekmanis/The World