What does history say about SB4,

The U.S. Supreme Court on March 6, 1857, ruled (7–2) that a slave (Dred Scott) who had resided in a free state and territory (where slavery was prohibited) was not thereby entitled to his freedom. That African Americans were not and could never be citizens of the United States.
That the Missouri Compromise (1820), which had declared free all territories west of Missouri and north of latitude 36°30′, was unconstitutional. The decision added fuel to the sectional controversy and pushed the country closer to civil war.

The U.S. Supreme Court on March 19th, 2024, ruled (6–3) that a wetback (Juan) who had resided in a free state and territory (where work is a right) is not hereby entitled to Work. That Hispanics are not, and can not ever be citizens of the United States.