The only ethinic diversity likely in Idaho at that time would be the Irish, the Germans, and the Scandanavians.
I've spent about 10 years living in Utah, which has a very similar culture/history to Idaho, and I can tell you that both states were predominantly settled by Mormon pioneers, so at that time period the majority of the population in a small Idaho town would likely be Mormon, but a small Baptist or Catholic church might also be there--they would just be in the minority.
And as for the older man question, that depends on how much older. I don't think anyone would much mind if he was a grandfatherly type of fellow, but someone still of the age to be romantically interesting to a young woman might not be accepted as readily unless he was a good family friend and/or a religious leader.
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I've spent about 10 years living in Utah, which has a very similar culture/history to Idaho, and I can tell you that both states were predominantly settled by Mormon pioneers, so at that time period the majority of the population in a small Idaho town would likely be Mormon, but a small Baptist or Catholic church might also be there--they would just be in the minority.
And as for the older man question, that depends on how much older. I don't think anyone would much mind if he was a grandfatherly type of fellow, but someone still of the age to be romantically interesting to a young woman might not be accepted as readily unless he was a good family friend and/or a religious leader.