Immigration has nothing to do with unemployment. The reason we have unemployment is the dumb ass democrats who insist on paying people to be disabled, paying people to be unemployed, paying people to have children, paying people to go to school, paying people to sit on their fat asses and smoke pot all day.
Oh, I dunno... as usual, the truth probably lies somewhere in the middle, although it strikes me that unemployment is less about immigration than it is about Big Business shipping millions of jobs to foreign labor pools where businesses can exploit cheap slave-wages labor without worrying about our own hard-fought labor-protection laws.
There is no escaping the impression that Illegal Aliens have saturated the labor-markets of several trades and industries and that they have depressed the wage-levels in those trades so that no American wants to work for the 'peanuts' that some of these employers can now get away with paying - exploiting Illegals at the expense of opportunities for American workers, while pocketing a higher profit margin for themselves.
My own observations are limited to the metropolitan Chicago area - the six-county region of northern Illinois that is my own stomping ground - but up here, Mexican and other Latin-American Illegal Aliens have pretty-much soured the Construction trade, including its 'offshoots' and 'kindred' such as Carpentry, Roofing and Metal-Working.
Illegals have also put huge and damaging dents into the Electrician and Plumbing trades, with flocks of bargain-basement 'helpers' (Illegals) - not bona fide 'apprentices', but simple 'helpers' - working for peanuts under the direction off a Master Plumber or Master Electrician; doing jobs formerly held by American 'apprentices' at a higher pay-scale.
Something similar can be said for the Landscaping trade and others which the Illegals have long-since overwhelmed (restaurant, cleaning services, house-painting, etc.) and which are probably in the same shape across the nation as they are in the metro Chicago area.
There's nothing wrong with conceding lower-paid jobs to mostly New Folk (legal immigrants), but there is a great deal wrong with allowing tidal waves of Illegals to saturate entire trades and professions and to undermine living-wage levels of formerly-respectable lines of work, so that no self-respecting American is willing to take such a job, working for table-scraps.
Rightly or wrongly, personally, I equate employers who take advantage of this flood, and who hire Illegals on such a scale, with the bullshit artists in Big Business who close-down entire US manufacturing and assembly plants and ship them overseas, to exploit thousands of poor worker-bees using proxy 'plantation' overseers.
Immigration (ILLEGAL immigration) is NOT the sole cause of unemployment, of course, but, rightly or wrongly, I perceive it to be large and significant
contributing factor; enough to make a Top 10 List of Factors Responsible for High Unemployment.