Immigrants do pay taxes, legal or not, because sales tax exists. Income tax doesn't really apply until you're richer.
The comparison to slavery is quite funny, because you're actually right. But probably not in the way you think - or even, the way most American politics talks about. For example, whenever a state gets a bug up their butt about illegal immigration and tries to actually enforce eVerify[0], the local agricultural sector collapses. Because American agriculture has always been addicted to slave labor, and always will be absent specific interventions to give agricultural workers negotiating power.
Of course, that's not the kind of intervention you're going to see out of Congress anytime soon. The arguments had in Congress, and with Trump, boil down to "how many indentured servants do we bring in, and for how long do they have to work before they get their rights back?" Illegal immigration is solely understood as a fault of the immigrant, not the companies who rely on them. Even the mass deportations are being carried out with the understanding that the slaves are the problem - not their masters.
And to be clear, the slave-like nature of immigration (illegal or otherwise) comes down to the fact that immigrants don't use the same job market Americans use. If I want to poach an H1-B, I have to go through hoops and pay an exorbitant sum to sponsor them. This means they can't demand equivalent salaries - even though the condition of their visa was that they'd be getting paid the same or better. It just doesn't pencil unless the immigrant works for peanuts and you're a huge organization that can swallow the compliance costs.
You can't get rid of slavery by whipping the slave harder. If you want to actually get rid of immigration-as-slavery, you need to hand out visas like candy, green cards to anyone who tells on their employer / trafficker / etc. for violating labor laws, and amnesty to people who have been here for a long time without a rap sheet.
[0] This is the US government service that actually tells you if you're hiring someone who has a legal right to work in the country or not.
The comparison to slavery is quite funny, because you're actually right. But probably not in the way you think - or even, the way most American politics talks about. For example, whenever a state gets a bug up their butt about illegal immigration and tries to actually enforce eVerify[0], the local agricultural sector collapses. Because American agriculture has always been addicted to slave labor, and always will be absent specific interventions to give agricultural workers negotiating power.
Of course, that's not the kind of intervention you're going to see out of Congress anytime soon. The arguments had in Congress, and with Trump, boil down to "how many indentured servants do we bring in, and for how long do they have to work before they get their rights back?" Illegal immigration is solely understood as a fault of the immigrant, not the companies who rely on them. Even the mass deportations are being carried out with the understanding that the slaves are the problem - not their masters.
And to be clear, the slave-like nature of immigration (illegal or otherwise) comes down to the fact that immigrants don't use the same job market Americans use. If I want to poach an H1-B, I have to go through hoops and pay an exorbitant sum to sponsor them. This means they can't demand equivalent salaries - even though the condition of their visa was that they'd be getting paid the same or better. It just doesn't pencil unless the immigrant works for peanuts and you're a huge organization that can swallow the compliance costs.
You can't get rid of slavery by whipping the slave harder. If you want to actually get rid of immigration-as-slavery, you need to hand out visas like candy, green cards to anyone who tells on their employer / trafficker / etc. for violating labor laws, and amnesty to people who have been here for a long time without a rap sheet.
[0] This is the US government service that actually tells you if you're hiring someone who has a legal right to work in the country or not.