One way would be to limit who can receive a passport or visa to travel to another country and another would be at the entrance to the country they may not be admitted for example due to inadequate funds to live. In my case, when I travelled by bus from Costa Rica to Panama, the Panamanian authorities required that I either have a ticket out of the country or a return ticket back to San Jose, Costa Rica.
Floods! Floods don't really happen to much, but there was a big one which caused the land to become super moist. Which made it difficult to do Dry Farming. I hope this helped! :)
