United States-Mexican border

Mexico–United States border
The border between Mexico and the United States spans six Mexican states and four U.S. states.
Characteristics
Entities	Mexico  United States
Length	1,951 miles (3,140 km)
History
Current shape	December 30, 1853
Treaties	Adams–Onís Treaty, Treaty of Limits (Mexico–United States), Treaty of Guadalupe Hidalgo, Gadsden Purchase

The Mexico–United States border is an international border separating Mexico and the United States, extending from the Pacific Ocean to the west and Gulf of Mexico to the east. The border traverses a variety of terrains, ranging from major urban areas to uninhabitable deserts. Approximately 350 million legal crossings occur annually, and is the most frequently crossed border in the world.

The total length of the continental border is 3,201 kilometers (1,989 mi). From the Gulf of Mexico, it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at Ciudad Juárez, Chihuahua and El Paso, Texas. Westward from El Paso–Juárez, it crosses vast tracts of the Chihuahuan and Sonoran deserts to the Colorado River Delta and San Diego–Tijuana, before reaching the Pacific Ocean.

There are twenty-three United States counties and thirty-nine Mexican municipalities along this border. There has been a dramatic population increase along with the United States and Mexico border. The main factors of population increase are significant migrations, increase in the number of employment opportunities along the border region in Mexico, and the increase in the number of people crossing the border into the United States in order to find better jobs and living standards. This border also plays a significant role in economic development on both sides and has negative and positive impacts on economic aspects when there is a change in populations or policies. This border also serves as the hub for trade and the exchange of goods. Mutual trade and exchange of goods make both countries depend on each other. Therefore, if one country, for example, faces economic issues, the other will also be affected by decreasing employment opportunities. Although they may be mutually dependent on trade and economic development, both countries operate on distinct sets on governance, legal, economic, and social systems. This border defines the sovereignty of both countries.