Historian Niall Ferguson claims that the United States could be headed to the same ruin of every previous advanced civilization if it doesn't fix its debt problem. Ferguson believes that Donald Trump's attempts to build empire could cost the US more than its worth. He cites Trump's plan to annex Greenland, make Canada the 51st state, as well as his plans for peace in Ukraine and what to do with Gaza as examples of expansion. Ferguson warns that the burdens of debt tend to weaken a great power and leave it vulnerable to military challenge. He also highlights the need for radical reform of America's entitlement programs to avoid a path of default and decline.