10 to 15 years ago! Wow, you love to watch ice melt.
I'm just going back to when we started building fences and increasing spending and resources devoted to border control. It was a slow steady increase, but it HAS had an effect. We know have far fewer illegal border crossings. Problem is we have more illegals because we have fewer return crossings.
The vast majority of illegals from the South used to come here to work seasonally. Most had no intention to stay. Now more stay because it's too difficult and expensive to cross two or three times a year.