That's not how immigration works. That's how the right want you to think it works.

I have literally never met anybody who has had their job taken by immigrants. Companies aren't allowed to pay immigrants less money than the current citizens so there's no reason to hire an immigrant over a citizen, in fact the opposite, a citizen is much more likely to understand the language and culture (although you do meet some people) and therefore much more able to integrate, and effectively operate in the business, whatever that business is.

If you want to emigrate into a country you have to usually prove that you're not going to cost that country any money. You have to prove that either you have the means to support yourself, or that you already have an offer of employment. The only exceptions that are made are for people who are fleeing persecution or conflict. But the vast majority of potential immigrants do not meet that criteria.

"Illegal" immigrates pay in sales taxes and use less public resources. They're generally a net gain for tax revenue.

It's actually not very complicated at all you're just painfully misinformed