If we look back into history, it's clear that the transfer of power from one president to the next has not always been cordial and/or problem-free. 

Examples: 

• Buchanan to Lincoln, 1860-61. During this transition seven states seceded. 
• Grant to Hayes, 1876-77. There were disputes regarding 20 electoral votes in four states, along with multiple allegations of voter fraud.
• Hoover to Roosevelt, 1932-33. After the election, Roosevelt refused Hoover's requests for a meeting to come up with a joint program to stop the crisis and calm investors, claiming it would limit his options.
• Clinton to Bush, 2000-01. This transition was shortened by several weeks due to the Florida recount. It was also marred by accusations of damage, theft, vandalism and pranks.

Advice on how to talk and work with fellow citizens with whom we disagree:

• John McCain's autobiography: The Restless Wave: Good Times, Just Causes, Great Fights, and Other Appreciations (E840.8.M467 A3 2018, print)
• Exploring the American tradition of civic debate: We Must Not Be Enemies: Restoring America's Civic Tradition (JK1726.A88 2019, ebook)
• A new way to lead based not on attacking others, but on bridging national divides: Love Your Enemies: How Decent People Can Save America from Our Culture of Contempt (JK1726 .B754 2019, print)
• Reversing the downward slide requires our participation: The Death of Politics: How to Heal Our Frayed Republic After Trump (JK1726 .W395 2019, print)

(Image from website medium.com)