Abraham lincoln’s 1858 warning that “a house divided against itself cannot stand” referred to sectional differences over the
(1)treatment of native american indians
(2)issue of slavery
(3)funding for internal improvements
(4)treaties with european nations

The correct answer that would best complete the given statement above is option 2. Abraham Lincoln’s 1858 warning that “a house divided against itself cannot stand” referred to sectional differences over the issue of slavery. For him, the "divided house" referred to in this speech was caused primarily by slavery. Hope this answers your question.