> The Supreme Court is not a political organization.
As someone with a Political Science degree that includes specific study of judicial politics in the United States, let me say that this is, very much, not true, has never been true, and is just silly.
> The rulings being made now are a continuation of 140 years of judicial precedent
...that has seesawed back and forth with the political winds over time...
> that alloted states enormous latitude in instituting their own laws
Even if that was an accurate simple explanation of any 140 years of precedent some of those recent controversial decisions denied states this ability, which complicates the narrative.
But it is perfectly consistent since it did so in favor of conservative policy preferences, just like the decisions that expanded state power.
> and that only ended in 1937, when FDR interfered with the SCOTUS's independence by threatening to "pack the court".
Aside from the documentary evidence that the switch of on one justices position that ended that threat actually happened before the threat was issued, there weren't 140 years of precedent on the application of the 14th Amendment before 1937, as there was only about half that time between the 14A and 1937.
The Supreme Court, because of lifetime tenure, often doesn't quite reflect contemporary partisan divides in the way one might naively expect, but it is quite political, and often partisan.