So those born to illegals are deported to Northern Mexico. This group then takes over the area, and asks to become part of the US. Is that the plan?
No, the plan is to flood this country with fraudulently documented foreigners to force US into another amnesty (tried for in 2006. 2007 & 2013) which would balloon the current 30 million illegal aliens to 100 million and fundamentally transform the USA into North Mexico.