I am hopeful that the USA, in its basic form, will last as long as does the Earth. The Constitution will be amended from time to time, and demographics will change, but the core principles -- separation of powers, individual rights to vote and freedom of religion, speech, and assembly, multiplicity of political parties, the right to own private property and freedom of commerce, are supported by the majority of those of us here and those likely to enter from abroad. I said the majority .... But I could be wrong. If we go down, as did the Roman Empire, the Soviet Union, Qing Dynasty, Ottoman Emprie, what will be the most likely cause?
Other: The lose of the USA having a free and independent press and news media. They were all bought out by the global super rich and international corporations. Google and Bing are assuring there is no free and independent news on the Internet. You also did not give "economic collapse" as a possible cause.
As an Australian a country that are an ally of America, it is in my best interest for America to remain as strong as possible, even though I do not always approve of the many decisions America make around the world. The biggest threat America face today is a combined effort from Russia, Iran (Hezbollah in South America) and China who have all in some shape or form worked together against the best interests of America and continue to do so. (For example the assistance given by China to Iran in missile technology/nuclear program and assistance from Iran and Russia to North Korea in their nuclear program). The threat from Hezbollah via drug cartels is obscure and if not stopped, will weaken America from the inside out. Certainly if you are looking for an internal threat I would suggest this to be the most imminent. The best options for America is to gather their allies close and gear up for the fight against Hezbollah, certainly drain their income asap so they can't fund their terrorist activities around the world. I also believe it would serve America's long term interest to remain in the middle east, Syria, Iraq and Afghanistan.
The greatest threat to the US is in the WH; as well as those who cheered for torture, mass murder, calls for violence, attacks on the free press, the intelligence community and law enforcement, judges and the courts, attacks on our allies, and who buy into little Hitler's campaign of war against the Constitution. The Constitution is under attack from within. That is the greatest threat this country has ever seen because Americans now betray themselves through ignorance. Liberty and democracy can be voted away. We can survive anything but self betrayal. Trumpers are crapping on the flag and the Constitution every time they cheer for trump. Trump and trumpers are the most dangerous enemies the US has ever faced.
The greatest threat to the US is its rogue government, all 3 branches. But if I had to pick which one is the most dangerous, I would say SCOTUS. They've been incrementally destroying the Constitution since Marbury v Madison (1803), when they seized the power to "interpret" it and therefore stealthily amend the Constitution so that it's nothing like what the founders meant or intended. That in turn gave the other 2 branches carte blanche to further trash the Constitution. And so instead of the republican (not the party) form of government guaranteed by the Constitution, the pretend US government is in reality a fascist oligarchy.
That falls under "Epidemic (disease)" If you remove "disease" you have just "epidemic" and that would come under uncontrolled immigration. (legal and illegal) But I would say since the immigration reform act of 1965 that opened up allowing uneducated, unskilled immigrants from third world countries along with chain migration has had the most disastrous impact on America.
I said exhaustion because civil war wasn't an option, and I believe our increasing political polarization is the most likely cause of a civil war.
Liberalism. We can defeat all our other enemies even if they all combined together to attack us at once, if we had the will to do so. Liberalism is sapping our will to do so. Islam is the greatest external threat, but it's only a threat because liberals refuse to recognize the danger. Economically, liberals have been destroying America with their tax and spend philosophy. On immigration, liberals have been destroying America with their open borders philosophy. On criminality, liberals would destroy America with their refusal to prosecute real crime but hound and persecute people for wrong thinking. In every case, the real threat isn't the threat itself, but liberalism that makes the threat dangerous.
Trump is no threat to America. If anything, Trump has saved the country for another generation. I doubt America could have survived a Hillary presidency. The country would have split apart into regional countries based on political affiliation, been overrun by Islamists, or both. Now we have a chance to impose rational limits on immigration, face the danger posed by Islam squarely, return our nation to law and order and capitalism, and get the government's budget and debt under control. A chance, one which the Republican Congress seems intent on squandering.
Pfft. Climate change, if it exists, will affect the US the least, because as the richest country, we are in the best position to deal with it. And if we refuse to cripple our own economy with pointless rules about carbon loading while all the other nations cripple their own, we'll actually benefit from climate change. If it exists.
I actually don’t think so. There is a valid economic reason to import immigrants. I just want them to do it legally.
Yup liberalism is the enemy with in.thank god Uncle Val stepped in and reported to the American public about Hillary and the DNC corruption..... Uncle Val.saved our constitution for another 40 years with the nomination of gorsuch...
Exactly who cares about legal immigrants we got laws , rules and such.. It's the poor broke ones that jump ahead of the line is the problem
We're already in decline and have been for decades. I don't think there is a historical precedence for reversal of that.
I would say the biggest long term threat is the national debt. Although the reckoning may not be that far into the future. Iran and North Korea probably pose more of an external threat than Russia, then there are the terrorist. But at the moment, our political divisions into pro and anti Trump factions may actually be the biggest threat. This bring down Trump no matter what the cost may have dire consequences. People putting the R and the D ahead of America is also a threat to this country. We seem able to handle the external threats, but the internal threats are growing. I do think a lot of our internal discord, the threats have been caused by the way our two major parties now go about elections and obtaining votes. Both use a divide and conquer strategy. They pit one group of voters against another group. Trying to get each group to hate the other and thus have each group vote in mass for the candidates and parties sewing that division and hate. In short, it has become a search for vote by trying to get you and the different voting blocks to hate the other guy more than they hate you. Each major party views the other as the biggest threat to his nation, more so than Iran, North Korea, the terrorist, the debt and any other threat one can think of. The fact so many of us have bought into that, that will lead to our own destruction. Our political discourse is the biggest short term threat, the national debt the biggest long term threat. If we last that long to see the long term.
You should have given the option to choose multiples and included an "all of the above" option. I don't think any one thing can do it except maybe foreign military attack through the use of nuclear weapons upon a few key cities. Trump will not and cannot destroy America in even 2 terms in office just like Obama, Bush and Clinton didn't, even though there were many who thought they would. No one person can do it so you all need to stop with the doom and gloom and I am not including the OP for his very valid question in the doom and gloom but all the others piling on with their fear of Trump.
I do agree with your assertions about the political parties and I see no feasible way out of it. The national debt though is different. "Although the reckoning may not be that far into the future." How can anyone foreclose on the debt we owe them?
Nothing is eternal. Egypt lasted for many milleniums and ended to disappear. I think that USA will disappear for the same reason a lot of european culture will disappear : exhaustion.
Other: Globalism - Specifically, globalism as defined and applied by those who embrace the objectives discussed at the World Economic Forum during their annual conferences in Davos, Switzerland.