How did Idaho get its shape?

When Abraham Lincoln signed the act creating Idaho Territory on March 3, 1863, it was a large rectangle that included Montana and most of Wyoming. ... Until 1863, Idaho was part of Washington Territory.

This is what i found on google “eightin 1997, the mccaughey septuplets were born in carlisle, iowa. multiple births of as many as eight babies have been born alive, the first set on record to the chukwu family in texas in 1998; one died and seven survived. in 2009, a second set, the suleman octuplets, were born in bellflower, california.” i was surprised about this . i don’t want to have that many babies .