First let me apologize for the sloppy editing in my earlier response to you. I ran out of time and the software would not let me finish editing.
I'm not suggesting that there is no limit to how much debt a nation like the U.S., the UK, Canada, Australia, or Japan, etc. can issue. Nor am I suggesting there is a limit. But if there is a limit no one has defined it.
We are as if on different planets. You are like the majority of people. You believe sovereign nation must manage their finances the way individuals must. If you spend more than your income you must borrow the difference and pay back your creditor over time from your future income.
Sovereign finances of the great nations are nothing like that. And until that can sink in I don't think we can discuss anything on this subject profitably. If you want to know why I think as I do, then read the sources I have given you. And come back in about 10 years after you have read and studied all of them.
I will mention these basics which will not make any sense to you. Keep them in mind as you do your reading.
a. deficit spending into the economy is how new base money gets into the economy.
b. deficits are essential to the creation of new base money
c. Base money is created, in the U.S. anyway, when the C.B. covers a net treasury overdraft. This could be booked as a liability on the Treasury side and as a negative liability, i.e., an asset, on the C.B. side.
d. Base money is the same as "outside money" , it is money that is permanent in the economy, in one of two forms, until it is taxed back out. It is separate and apart from credit money which is created when a private sector loan is made and disappears when the loan is paid off.
e. The Treasury sells bonds in amounts matching the newly created base money.
This removes new base money from the economy and replaces it with a bond (think of the bond as an interest paying substitute for money. It does not represent real debt in the way.)
f. Government issued bonds, when they are denominated in the government's own fiat money, are NOT DEBT instruments, they just appear to be debt instruments. The Central Bank can buy them back at any time they want to, and do. Th C.B. of Japan just recently retired ~ 50% of JGBs by buying them back. Q.E. buys them back, but the Fed bought back only a small fraction of the bonds issued in recent Q.E..
g. The purpose of bonds is not to raise money from the private sector. The purpose is to provide a tool to the Central Bank for temporarily removing base money from the economy, and to put base money back into the economy as needed.
h. There is no national debt! Everyone calls the total of new base money created and spent into the economy the "national debt" because it looks like that from the outside. The National Debt = net total of new base money created = net total of the deficits!!!!!!!!!!!!!!!!!!!
i.The only question governments must answer is how much new total base money is needed in the economy at any particular time.
j. Taxes permanently remove base money from the economy. They are a powerful tool of legislative bodies, not of the Central Back.
k. Taxes are mainly a tool for regulating the distribution of money in the economy and providing economic and social incentives.
Though this is rapidly changing, practically no politicians, nor bankers, nor economists, nor people on the street understand any of this. But thankfully this is changing.
Please spend few years reading Minsky, Wray, Mitchell Kelton, Mosler, Galbraith and many many others. Then come back. THERE IS NO NATIONAL DEBT in the sense that say Senator Manchin or you think there is. When we say "National Debt" we are referring to the net amount of base money created. Net Base Money Creation= Net Spending - Net taxes. Obviously net taxes can not exceed net spending. (There would be no money to pay taxes!

) When net spending equals net taxes there is zero base money in the economy. DEFICIT SPENDING IS ESSENTIAL TO A GROWING ECONOMY!!! the only question is how much deficit is appropriate at any given time and what should be the rate of growth in base money. This must be kept in line with PRODUCTIVITY. OUR MODERN FIAT MONEY IS BACKED BY PRODUCTIVITY.
Your statement: "The evidence demonstrates that high government debt and high government deficits lead to sovereign debt crisis and economic crisis. " is absolutely false
for countries that issue debt in their own currency. There are plenty of economic crises, but they are not caused by non-existent high debt. If you examine the instances you have in mind you will see that they are often caused by a collapse in productivity, government corruption, etc. High "debt" is just ancillary. It is not the root cause if the country issues its debt in its own currency.