PowerPoint Show by Andrew

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The border between the United States and Mexico has become a major issue in the upcoming presidential election. It stretches 3,169 kilometers (1,969 miles), crossing deserts, rivers, towns, and cities from the Pacific to the Gulf of Mexico.

Every year, an estimated 350 million people legally cross the border, with some 400,000 entering into the United States illegally. No single barrier stretches across the entire border, instead, it is lined with a patchwork of steel and concrete fences, infrared cameras, sensors, drones, and nearly 20,000 U.S. Border Patrol agents.

Mexicans stand on the beach while looking through the U.S.-Mexico border fence into the United States on May 1, 2016 in Tijuana, Mexico. 

A U.S. Customs and Border Protection helicopter pilot looks through night vision under moonlight near the U.S.-Mexico border late on August 19, 2016, over Hidalgo, Texas. 

The U.S.-Mexico border fence snakes over sand dunes on September 28, 2016 in the Imperial Sand Dunes recreation center, California. 

Texas State Troopers patrol the Rio Grande at the U.S.- Mexico border on August 18, 2016 near McAllen, Texas.

A U.S. Border Patrol-operated Aerostat surveillance balloon awaits takeoff to overwatch the U.S.-Mexico border on August 16, 2016 at Roma, Texas. 

A U.S. Border Patrol agent uses night vision goggles to search for illegal immigrants under a full moon on August 17, 2016 near Roma, Texas. 

U.S. Border Patrol agents take undocumented immigrants into custody after capturing them after they crossed Rio Grande from Mexico into Texas on August 18, 2016 near Sullivan City, Texas. 

Undocumented immigrants comfort each other after being caught by Border Patrol agents on April 13, 2016 in Weslaco, Texas. 

U.S. Border Patrol agents process immigrants from Central America while taking them into custody on August 17, 2016 near Roma, Texas. 

Central American immigrants wait to be transported after turning themselves in to U.S. Border Patrol agents on December 8. 

A pregnant Central American immigrant stands in line for a bus to an onward U.S. destination after being released by the U.S. Border Patrol on August 15, 2016 from McAllen, Texas.

People stand in line to cross legally into the United States from Mexico on September 24, 2016 in Tijuana, Mexico.

A U.S. Customs officer checks identifications as people cross into the United States from Mexico on September 23, 2016 in San Ysidro, California. 

Maria Rodriguez Torres, 70, embraces a grandchild after seeing her other grandchildren for the first time through the U.S.-Mexico border fence on September 25, 2016 in Tijuana, Mexico.

Crosses reading "Hope" and "Not forgotten" in Spanish mark an immigrant's grave on September 27, 2016 in Holtville, California.

A digger removes sand drifts along the U.S.-Mexico border fence on September 28, 2016 in the Imperial Sand Dunes recreation center, California. 

A U.S. Border Patrol Aerostat surveillance balloon flies near the U.S.-Mexico border on August 18, 2016 in La Joya, Texas. 

An undocumented immigrant runs from U.S. Border Patrol agents on December 9, 2015 near McAllen, Texas.

U.S. Border Patrol agents search a migrant family after they crossed the U.S.-Mexico border on December 9, 2015 near Rio Grande City, Texas.

Immigrants cross the Rio Grande illegally from Mexico into the United States on April 14, 2016 in Roma, Texas.

U.S. Border Patrol agents detain undocumented immigrants, one of them who needed medical attention, after capturing them in thick brush near the U.S.-Mexico border on December 10, 2015 at La Grulla, Texas. 

Detained immigrants are led through the brush after being captured by U.S. Border Patrol agents on August 16, 2016 in Roma, Texas. 

A U.S. Border Patrol agent leads undocumented immigrants through the brush after capturing them on December 7, 2015 near Rio Grande City, Texas.

A U.S. Border Patrol vehicle stands guard along the U.S.-Mexico border fence on September 26, 2016 in Jacamba Hot Springs, California. 

Ania, 9, from El Salvador walks with her father through the Texas countryside after crossing into the United States, to seek asylum on April 14, 2016. 

Family members under U.S. Border Patrol supervision during an "Opening the Door of Hope" event on April 30, 2016 in San Diego, California. 

The border fence stops at a hillside on the U.S.-Mexico border in Jacamba Hot Springs, California, photographed on September 26, 2016.