The flow across the Canadian border is slower because there are many, many more people south of the US than north of it. Mexico alone as almost four times Canada's population and a substantial percentage of the people trying to cross into the US come from further down in Central and South America.
Unaccompanied minors are a red herring. According to the Chief of the Border Patrol, 0.02% of them are suspected or confirmed to have ties to gangs (meaning 99.8% are not).
https://www.judiciary.senate.gov/meetin … the-threat
MS-13 is also a red herring. Jeff Sessions says they have 10,000 members in the US, which is supposedly a large increase. In 2006, when nobody was talking about illegal immigration or this gang, they had....10,000 members in the US
Sessions says 10k is an increase: https://www.c-span.org/video/?c4666617/sessions-ms-13
2006 FBI estimates MS-13 at 10,000 US members https://archives.fbi.gov/archives/news/ … rrus041906
Crime is a red herring. Crime rates are lower along the border.
https://www.newamerica.org/weekly/112/c … he-border/
And really, nothing we do is going to stop trafficking as long as we allow the cartels to infiltrate the CBP
"what good are more boots on the ground if the men and women wearing them also work for the cartels? What benefit is an 18-foot wall when criminals can bribe their way through the gate?"
https://www.texasobserver.org/homeland- … er-patrol/