"In the United States, you’re always allowed to record your own calls, though you may also be required to inform the other parties on the line that you’re recording."

That isn't accurate for a handful of states, including Pennsylvania (where I live, unfortunately). PA, and I think three or four other states, has an All-Party CONSENT law whereby ALL parties on a call must consent to being recorded, not merely "notification" (being informed). There are exceptions, but none of them are good (law enforcement). And it is a 3rd class felony with $1000 fine PER infraction…so if you get caught, you really can get hung out to dry. So, in effect, you can notify the other party you want to record, they can say "no" and keep on talking, implicating themselves in pretty much anything short of a provable felony…and you're in the wrong if you record them.

(In one PA case, there was a teenaged girl who recorded her father admitting to having sexually molested her; the county DA brought felony charges against HER! Turned out he was politically connected. In the end, justice was served; he was convicted and the charges dropped against her. But still. I've been working unsuccessfully with my local representatives to get the law changed to little effect. Extreme fundamental misunderstanding--utterly disgraceful ignorance IMHO--of "wiretapping" and "eavesdropping", and First, Fourth, and Fifth Amendment rights in the PA Capitol.)