Your comparison of the mexicans to the "Irish" does not make sense and is not much of a comparison at all. The Irish were not on welfare or sucking up tax money, as there was no income tax then, or freebies from the government. Therefore they (the Irish) could not freeload off of the other Americans. Most had, or were in the process of getting the hell out of there, you will not see the mexicans going anywhere. The Irish came here on a boat through the legal system of that time and did not criminally cross the border.
Just because I don't like the facts does not mean they can not be changed. And that is where you and the majority of folks will differ. You seem to believe that the current situation is the only set of "facts" that can exist. That situation on the border can change OVERNIGHT if need be. And yes, closing the border can and has happened in the past. It can happen again. The economy will change a bit from a border closure but be adversely impacted? NO.
What will change the economy for the better is to put the brakes on an invasion of a "culture" that bows to a centralist government theory instead of maintaining freedom. What a coincidence that all this is happening when the politicians have become so bland on issues that government welfare for criminal invaders has become THE issue of choice for the communists (democrats) in a presidential election. One more thing, the economy will flat out go into the toilet if the criminal illegals are not stopped as it is theorised that the Dow Jones and the S&P don't do very well when there are about 5 to 7 million American in OPEN FRICKIN REVOLT.
Your logic seems to run in circles except when you indicate a rather static view of the situation. If the border does remain open that very likely WILL be the cause of another major terrorist attack. Which will result in border closure. While it does remain open it will be the kiss of death waiting to happen, as the closure and deportation of the criminals will result in a dramatic drop in crime. The politicians will be standing there with their d|(&$ in the breeze with no explanation as to why they did not close that border TEN YEARS AGO. This in itself will CHANGE the situation, again. Some change will be seen when that current crop of politicians are run off. The best results will stem from the identification and deportation of the criminal illegals.
By the way . . . aren't you noticing that nobody is offering any support to your theory on how "labor flow" is the beginning and end of things influencing events? Don't you know Americans are FAMOUS for doing things that might not make robot-like sense, but just because they damn well wanted too?
Study a little real military history for a bit of an eye opener regarding what Americans are capable of when they get, much as they are now, good and PI$$ED OFF. You will find the "government" scrambling to play catch up.
Move? Nah, I don't think so. After all, I'm one of those "Hitleresque" redneck, undereducated, gun totin dumb-ass Texans, right? I'm just here cause I live for the sound of hot lead smacking raw flesh, right? What would I know about what is good for me?
TLI
Oh but they were. It just wasn't called "welfare" it was called charity. Then there were the "poor houses" and "work houses". The Irish were violent, drank to excess and spoke funny. They fought. They were territorial. South Boston still has this reputation.
The Irish immigrants formed "gangs". These gangs were involved in theft rings, murder for hire and protection rackets. No one felt safe going into their neighborhoods to, using your phrase, "buy groceries".
Facts don't change. The Law of Supply and Demand is immutable and will not bend to your fantasy. You can raise the costs associated with labor migration but, just as with any other commodity, it will find a new level. You might as well fight the ocean.
Open revolt? Ha!
Economics is the overriding influence. I'm constantly amazed that the children of capitalism continually fail to recognise that fact. At least the Founders did.
Everything mankind does is influenced by scarcity and abundance. The system works well until some entity, be it government, religion or an abstract group, tries to artifically control access. Left to its own devices, "the invisible hand" will find a balance.
btw, I can read unbolded text just fine, thank you very much.