The Koppen Climate Classification system is based largely on the factors of temperature and precipitation. A climates are tropical and have year round warm temperatures with varying precipitation. B climates are universally dry but can be cold or hot. C climates are temperature and can be mild, cool or cold. D climates are continental and are characterized by their extreme conditions. E climates are permanently cold, polar regions and H climates are those found at high altitudes.
The Mexico–United States barrier (Spanish: barrera México–Estados Unidos), also known as the border wall, is a series of vertical barriers along the Mexico–United States border intended to reduce illegal immigration to the United States from Mexico.
