Why did U.S. banks go into crisis?

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For days, banks in the United States are already suffering the consequences and is that after more than a year in which the Federal Reserve of the United States has been raising interest rates almost psychotically, In the end, the effects have started with one of the most fragile pieces of the economy: the banks; which increasingly increases fear and uncertainty on whether our savings are still safe in the bank, even if the Fed ends up making a 180-degree turn for fear of wiping out the country's economy.
Well, in this post I am going to comment on the US banking sector how it is affecting the country's economy starting with:

SILICON VALLEY BANK: is a bank that had a large clientele and served almost half of the American companies of technology and life sciences backed by venture capital. according to official sources. On the other hand, they also offered these small businesses a financing capacity very adequate to their needs, something the largest and best-known banks could not afford. It should be noted that banks do not make money simply by having their customers' funds stored there, In fact, what they do is use these funds to invest them in the meantime, then, in a series of instruments that generate a return on them and in this case, as in the case of a large number of U.S. banks, they had a very large sovereign debt portfolio and the continued rise in interest rates plummeted the value of these investments, which were supposedly zero risk. Then his clients, seeing the delicate situation that the bank had at the financial level, began to request their funds, what ended up in the classic bank panic because that money was no longer there, and financial regulators have had to intervene in order to ensure the situation and prevent fear from spreading.

Which soon after ended up affecting Signature Bank, another large banking firm that has been exposed to the fear generated by Silicon Valley Bank. and that has finally been translated as the third largest bank failure in the history of the United States. All this has not only seriously affected stocks and a large number of companies in the banking sector, Rather, fear has spread over the possibility of compromising the financial situation of a large number of technology companies that were already suffering serious problems with the rise in interest rates. All this is something much more worrisome than we can imagine, because a deterioration in credit quality means that a large number of companies in the sector are going through a rather complicated financial situation, which in fact is going to drastically increase borrowing costs, increasing the pressure received directly from high interest rates and putting the entire banking sector in the United States on the line. However, all this could change thanks to the measures that the Fed could implement very soon.