[iowamark]

Great diagram. I would guess that the many schisms from the 1830’s to 1860’s involved the slavery issue. The splits in America’s churches between pro and anti-slavery types were a precursor to the split in the Union.

[AnAmericanMother]

The big split as a result of the WBTS was the 1861 departure of the Confederate Presbys from the "Old School" and the United Synod departure from the "New School" (although that was a much smaller group.) Most of the other schisms were purely doctrinal or governance-related (e.g. the Cumberland Presbys who had some theological differences but mostly didn't want preachers to have to have a theology degree - not unreasonable for folks on the frontier). This is unlike say the Methodist Church North/South split which was almost entirely a result of the WBTS.

Doctrinal disputes in the Presbyterian Church are practically a national sport. That's one reason why their preaching is so good.