Kudos for the people of Arkansas! The Catalogue For Philanthropy has again list Arkansas among the top givers of the country. As you look at the list you note that the biggest givers have the lowest income.
But the Bible Belt and Utah are, with generally low incomes, giving so much (as tithing evangelical Protestants), that in effect they set a high example, which suggests that the wealthiest taxpayers in the wealthy states can afford to give significantly more.
Generous hands are blessed hands because they give bread to the poor. (Proverbs 22:9)