I've recently requested this question – Is the Memorandum of Understanding between California and China legal to be migrated to Law.SE.
This's asking for the legality of the MoU signed which is better suited for Law.SE.
However, it was subsequently declined and the comment given is:
What political actions a state government can or can not do is on-topic on politics.se
After rereading "What topics can I ask about here?" in the help centre, it seems like it's part of "Matters of Policy".
Matters of Policy:
Central to the idea of this site are the nuts and bolts of policies introduced by governments, presumably for the welfare of their citizens. As such, asking about the tangible benefits and costs of legislation is on topic
However, the question explicitly asked if it's legal under the US law and isn't regarding the policy introduced by the government.
The question is currently closed as it "does not appear to be about governments, policies and political processes within the scope defined in the help center."
There's a question on Meta, Where/how do we draw the line between legal and political questions?, regarding where to draw the line between politics and law questions. I personally thought that Philipp's answer is good and clear and it states:
So when you want to know "according to law X, is it illegal to do Y?", your question should be posted on law.SE. When you want to know "What were the arguments to enact law X, who backed it and who opposed it?" your question belongs to politics.SE.
So, is this question on-topic on this site or is it fine for both Politics.SE and Law.SE?