1. PowerPoint Show by Andrew
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PowerPoint Show by Andrew

2. 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.

3. 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. 

4. 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. 

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

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

7. 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. 

8. 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. 

9. 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. 

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

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

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

13. 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.

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

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

16. 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.

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

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

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

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

21. 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.

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

23. 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. 

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

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

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

27. 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. 

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

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