What the US-Mexico border looks like before Trump's wall

Updated 5:15 PM ET, Wed January 25, 2017

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(CNN)On his sixth day in office, President Donald Trump signed executive orders to begin construction of a wall between the United States and Mexico, making good on a campaign promise. He also announced he will boost deportation efforts and beef up border patrol resources along the border.

The 1,933-mile barrier cuts through towns, rivers and desolate terrain and across California, Arizona, New Mexico and Texas. Here's a look at how the US-Mexico border looks before the construction of the wall begins:
The border fence separates two sides of Nogales: Nogales, Mexico, on the right and Nogales, Arizona, on the left. In 2016, US Border Protection says it had 17,026 out of 19,828 agents posted along the Southwest border.
The Rio Grande snakes along the US-Mexico border on January 3, 2017, near McAllen, Texas. As CNN's Gregory Krieg reported, "The Rio Grande is a natural border, has been since 1848, and the ties between cities and towns on either side are strong. Trade in the region is booming and citizens of both countries move between them with relative freedom."
In California, part of the US-Mexico border fence snakes over sand dunes that sometimes wash over the fence.