This is some classic conservative dogma, here. Of course, though much of it has been demonstrated to be wrong for at least 40 years, people continue to repeat it.
For the most current example, we can look at the recent tax cuts, which lowered corporate taxes significantly. We heard no end of promises of reinvestment in the US, higher wages, etc. We got stock buybacks instead. No need to believe all the left economists like Krugman that said this would happen - the ratings agencies predicted it as well [1]. Skyrocketing incomes indeed - for the owner class.
You advise closing the borders, which not only goes against American principles, but would reduce business creation -
> “Immigrants are about twice as likely as natives to start new businesses,” says Arnobio Morelix, an analyst at the Kauffman Foundation, which promotes entrepreneurship. [2]
> 216 companies on the Fortune 500 were founded by immigrants or their children [3]
Frankly, I would expect that one of America's continuing strengths is that the people willing to make the journey here are driven folk, willing to travel hundreds or thousands of miles to start a new life in an unfamiliar place, even if they have to work endlessly when they get here.
And truly, I am confused why zeroing corporate taxes would reduce offshoring. If I can pay someone in a different country 1/10 of what I need to pay here to make my goods, corporate tax rates have no impact that I can see on this calculation, and the offshoring would be done regardless.
Is there a reason we need to reduce social spending? Or reduce taxes, as was demonstrated to have little effect in 2001, and 2009 [4], and 2017 [1]? Perhaps if you clarified what you meant by handouts, we could get to some kind of useful discussion - but then it seems frequent that "handouts" is used for a catch-all with no real meaning, and when it comes to nuts-and-bolts changes to government spending, people that advocate for reductions never seem to actually pull it off - I think we can look at Paul Ryan as the most recent example (tax cuts now, we'll figure out spending cuts later, or maybe never).
[1] https://www.axios.com/trump-tax-cuts-companies-stock-buyback...
[2] https://www.apnews.com/ab44ff583d194070a5eae431231c4450
[3] https://qz.com/1151689/216-companies-on-the-fortune-500-were...
[4] https://www.americanprogress.org/issues/economy/reports/2011...