I spoke to Ann at Elephant Thai about the Lincoln Phenomenon. She explained that Chulalongkorn, better known as King Rama V freed the slaves in Thailand some time after Lincoln did so here in the USA, so there is an affinity for both Lincoln and Rama V among many Thais. She also mentioned that Thais are pretty superstitious, and a portrait of Lincoln could also be a homage to Illinois, in some cases.
Chulalongkorn was best known for his abolition of Siamese slavery. He associated the abolition of slavery in the United States with the bloodshed of the American Civil War. Chulalongkorn, to prevent such a bloodbath in Siam, provided several steps towards the abolition of slavery, not an extreme turn point from servitude to total freedom. In fact, American and Siamese slaves were not on the same basis, as American slavery was racial in nature whereas Siamese slavery was economic in nature. Those who found themselves unable to live on their own poverty sold themselves into slavery of rich noblemen. Likewise, when a debt was defaulted the borrower would became a slave of the lender. If the debt was redeemed, one's freedom was regained.
Steve Z.
“Only the pure in heart can make a good soup.”
― Ludwig van Beethoven