New series. Síle Nic Chonaonaigh visits the border between the US and Mexico. Stretching for almost 2,000 miles from the Pacific Coast to the Gulf of Mexico, she hears moving stories of love and loss as well as of hope and compassion. Around 750 miles of impenetrable wire fences, concrete walls and iron barriers already exist along the border, but President Trump is determined to extend the wall along this boundary to keep out the hundreds of thousands who cross into America illegally each year.