So the US Supreme Court voted to allow Trump to start constructing 100 miles of wall. Bloomberg - Are you a robot? The wall segments in Arizona, New Mexico and California would give Trump a tangible achievement to tout in his campaign for re-election. Until now, congressional and court resistance had thwarted significant progress toward a stronger barrier on the almost 2,000-mile (3,200-kilometer) frontier. During his first campaign, Trump said Mexico would pay for the wall. The 30-foot steel bollard fencing would replace barriers that the Trump administration says are dilapidated and ineffective. Some of those existing barriers are designed only to prevent vehicles from crossing and don’t stop pedestrians.Now this is the border barrier situation in 2017, and it shows in shaded pink areas where most apprehensions of illegal crosses are made. Note how the Big Bend area is already a fairly effective barrier to human traffic, little needs to be done there. So Trumps wall will go in piecemeal as existing inferior wall is replaced and upgraded to more effectively prevent entry and allow our border Patrol agents to see through to what the criminals are trying to do. FACT CHECK: Trump Says 'A Lot Of Wall Has Been Built' As He Demands We Build More To date, the fencing is a hodge-podge of projects covering about 650 miles. In November, the government announced a $324 million contract for 32 miles of "primary pedestrian replacement wall" in Arizona. A 20-mile border wall replacement project in Santa Teresa, N.M., was announced in April 2018. The cost is reported to be $73.3 million. A 6-mile "levee wall system" is set for construction in Texas's Rio Grande Valley beginning in February 2019. It will cost $145 million. A 14-mile "border wall construction project" along the border in San Diego was announced in June 2018. The project actually will replace an "eight-to-10 foot high scrap metal wall with an 18-to-30 foot bollard-style wall topped off with an anti-climbing plate." The cost will be $147 million. National New Southwest Border Arrests Jump 78 Percent In November The dramatic declines in "illegal traffic," as the president put it, appear to reflect the long term impact of fencing and other factors that go back to the 1990s. The larger picture is more complicated. Border apprehensions — an indicator of overall unauthorized border crossings — have declined since 2000 when monthly totals were as high as 220,000. That same year 1.6 million unauthorized border-crossers were detained.Starr County Texas is a good illustration of this and how it will be implemented. Maps reveal planned locations for border wall construction in Starr County - The Monitor Already the areas where the wall has been upgraded have shown a huge impact in making our agents safer and in preventing braches along that roughly 2 mile section. EXCLUSIVE: Completed Section of Trump’s New Wall Helping Secure Border, Say Agents So if Trump can replace the current 650 miles of low quality fencing and upgrade it to his Bolard 'fencing' then I would say he has accomplished much to secure our Southern border with Mexico, but he has a very long way to go.