Successful countries are characterized by a fidelity to long-lasting traditions and institutions, including the rule of law. Jurisdictions characterized by few constructive traditions, weak institutions and failures to maintain the rule of law are prone to chaos. The U.S. is threatened at the moment by calls to undermine a key institution the U.S. Supreme Court and by certain state and local authorities who are failing to maintain the rule of law. There are a couple of non-complex and very doable solutions for these two problems.
The American Founders were keenly aware that parliamentary democracies tend to evolve into corrupt majoritarian tyrannies, so they designed a republican form of government with three branches of government to checkmate each other. The Founders understood that the U.S. Constitution they created was not perfect and from time to time would need to be amended in an orderly and defined way. It took a century-and-a-half to grant full rights to former slaves and women, but it was accomplished.
George Washington established the tradition of a president only serving two terms, which was observed by all American presidents up to Franklin Roosevelt. Roosevelt was elected to four terms but only served a few months into his fourth term before dying. Both Republicans and Democrats quickly understood that more than two terms was not a good idea, and so the 22nd Amendment to the Constitution, limiting a president to two terms (codifying the tradition), was ratified in 1951.
The tradition of nine judges on the U.S. Supreme Court has been in effect since 1869, even though Congress could have changed it. The Constitution is silent on the number. Roosevelt proposed increasing the number to obtain a court more to his liking, but even many members of his own party rejected the idea, and it was never