@Ionus,
The laws of the US are made up from
1whats in the Cosntitution
2whats in the Codes of Federl REgulations (CFRs)
3what the SUpremeCourt sefines the laws to mean (with respect to the Constitution)
The US Constitution
NEVER contained language about slavery until the 13th Amendment which stated simply
"Neither Slavery nor Indentured servitude(except as a means of criminal punishment), shall exist in the United STates)
Prior to this, and since at least 1790's till the Civil War, there had been several laws and decisions maded by the US govt and Courts that actually Aided and ABetted the industry of slavery. (It was considered a means of conducting business in the mainly rural southern states where agriculture ruled). There were actually 2 key laws passed by Congress in 1793 and in 1850 that were called "The Fugitive SLave ACts". The last of these (the 1850 version), Actually REQUIRED any citizen to give assistance in the recapture of reunaway slaves so they could be returned. As a result of the First Fugitive SLave ACt, the vast anti slavery movement began to focus their activities to assist runaway slaves to reach freedom of the "Free STates" or into Canada. The institution called "The Underground RAilroad" had developed very sophisticated paths of escape in the East and Midwest US. (the use of these "railroads" in 19th century US literature is an example of how most people in the Northern states felt about the institution of slavery). When the 1850 lkaw was passed, it led to open defiance of the law. In Boston there were large demonstrations against the movement of several slaves to the docks for return to their "owners" and in Pa in 1851 , in a town called Christiana (about 4 miles from my farm) was the "Christiana Riot" where a bunch of slave hunters were held and fired on , and a subsequent skirmish ensued that left a person killed and several wounded and lots of propwerty dmage as the rioters "smoked the slave hunters out". This was quelled by the militia and the slaves were returned (I believe). The Christiana Riots ere considered to be the "Opening SHots of the Civil War, over 10 years later) SO, the Constitution said nothing against slavery, the SUpremes had found in FAVOR of slavery byseveral decisions during the early 19th century, and the CFRs actually included laws that aided slavery.
In 1862 Lincoln signed an executive order, "what became known as the "Emancipation Proclamation". That was actually just a kind of hutzpah because it didnt really do anything except piss off his ennemies since it really was a "command for rebelling states to return to the Union by Jan 1 1862".Then, in the second half of the Proclamation, he identified in which 10 states the actual proclamation would apply.
It really wasnt until Lincoln had securely been re-elected in 1864(thanks in part to some key victories of the Civil War) that he enacted his plan to have Congress forward to him, for his signature, an actual AMENDMENT to the Constitution (the 13th) which outlawed slavery. This amendment was signed by Lincoln in JAnuary 1865 and was ratified in December of that same year by the necessary 2/3 state legislatures (due in large part to the really brilliant career move by Lincoln to get assassinated

).
SO, as far as slavery went, we actually officially condoned it for most of our history before the civil war. It was an important issue of the civil war. The 13th amendment finally forbad slavery in December 1865.
NOW, making something illegal and getting it to be accepted, are two different things. The post '13th AMendment" history of the US requierd another (easily) 120 years to even make reasonable dent into the concept of equal rights for all. There we have a statement in our Declaration of Independence that talks about "equal rights" and "all men are created equal". These goals took over 300 years to be "fleshed out" .
So when I worry about being vigilant about the freedoms of (and from religion), I and ed, ros, set, and other US folks are a bit cynical about how things go . I doubt that an amedment to the 1st will arisethat favors one minor religious viewpoint. I do get concerned that if several states begin this great journey backwards based upon a literal view of ONE VERSION OF ONE RELIGIOUS DOCUMENT(, then the US SUpreme Court, depending on how politically mixed it is) may look favorably on some local laws that are becoming increasingly built upon fine points of constitutional law in a blatant attempt to skirt the "establishment cluse". THIS could happen should we ever get a majority conservative (Evangelical) court.
I dont think that the present court is that instrument because even Roberts and ALito, two ultra conservatives , ARE CATHOLICS not evangelical Christians> CAtholics are NOT idiots when it comes to accomodation with science. However. The SUpreme Court is made up on a purely random fashion dependent upon the
ages of its inhabitants during any particular presidents reign
2The social pressures of increasingly strident evangelicals and their minions in states like TExas, Arkansa and Louisiana.
ITs highly unlike;ly that the establishment clause will be interpreted in any fashion other than the way that Judge Jones stated in his DOver decision (Hes a conservative GOP , but is NOT an evangelically leaning one).
SO, in summary, our history of slavery has been one of quiet and public advocacy for much of our early history. The proces of change was slow and I hope I was clear in my rambling.
Evolution, as a basic underpinning of ALL BIOLOGY. should NEVER be subject to the caprice of evangelistic interpretation. There can therefore, NEVER be any accomodation to Creationistic bullshit or IDiotic Bullshit in BIOLOGY CURRICULA. It takes constant vigilance to keep anything unscientific from happening in the many corners of the vast US territory.
Ill bet Ionus that, its very similar in your own country (which is about the same size as ours). Its a map that celebrates and allows huge differences of regional opinions and rules. However, there are some basic universals that should never be fucked with, and I and several of us here have been active (not only in this forum buit in the real world) in ntrying toprevent the evangelical worldview from gaining ANY toeholds.