> Illegally immigrating to the US is a civil violation, not a criminal one

It can be both, depending on the situation:

• First-time illegal entry into the U.S. (like crossing the border without inspection) is a criminal misdemeanor under federal law (8 U.S.C. § 1325).

• Unlawful presence (like overstaying a visa) is usually a civil violation, not criminal. It can lead to deportation but not criminal charges.