Fact, the Moody downgrade was a non-event.
The SP500 was up.

JP Morgan chief executive Jamie Dimon warned on Monday that investors were being too complacent as markets shook off news that the US has lost its last triple-A credit rating amid fresh concern over the federal government’s burgeoning debt pile.
Credit ratings agency Moody’s dealt a blow to Washington on Friday when it stripped the US of its top-notch rating, downgrading the world’s largest economy by one notch to AA1 and become becoming the last of the big three agencies to drop its triple-A rating for the US.
The announcement unnerved markets on Monday morning, but stock markets had recovered by the end of the day. Speaking at JP Morgan’s annual investor day meeting in New York, Dimon warned against complacency. “We have huge deficits; we have what I consider almost complacent central banks. You all think they can manage all this. I don’t think [they can],” he said.
Dimon said he saw an “extraordinary amount of complacency” and added that he believes the possibility of stagflation – a recession with rising prices – was far higher than investors believe.
On Wall Street, the benchmark S&P 500 fell during early trading, before recovering its losses to close marginally higher, while the tech-focused Nasdaq also closed broadly flat after reversing early declines. The FTSE 100 rose 0.2% in London.
Bond markets also came under pressure, with the yield on 30-year US treasury bonds climbing 13 basis points to 5.026%. Yields rise as bond prices drop; an increase signals that investors are seeking a higher return for holding US debt. The dollar weakened against a basket of currencies.
“Over the next decade, we expect larger deficits as entitlement spending rises while government revenue remains broadly flat,” said Moody’s. “In turn, persistent, large fiscal deficits will drive the government’s debt and interest burden higher. The US’s fiscal performance is likely to deteriorate relative to its own past and compared with other highly rated sovereigns.”

Under the extended baseline scenario, which generally adheres closely to current law, federal debt would gradually decline over the next 25 years—from an estimated 73 percent of GDP this year to 61 percent by 2022 and 53 percent by 2037. ...
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The budget outlook is much bleaker under the extended alternative fiscal scenario, which maintains what some analysts might consider “current policies,” as opposed to current laws. Federal debt would grow rapidly from its already high level, exceeding 90 percent of GDP in 2022.

CBO produced an extended baseline for this report that extrapolates those projections through 2038 (and, with even greater uncertainty, through later decades). Under the extended baseline, budget deficits would rise steadily and, by 2038, would push federal debt held by the public close to the percentage of GDP seen just after World War II—even without factoring in the harm that growing debt would cause to the economy.
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[U]nder the assumptions of the extended baseline, CBO projects [b]y 2038, the deficit would be 6½ percent of GDP, larger than in any year between 1947 and 2008, and federal debt held by the public would reach 100 percent of GDP, more than in any year except 1945 and 1946. With such large deficits, federal debt would be growing faster than GDP, a path that would ultimately be unsustainable.

Credit rating agencies are inclined to apply a de-facto sovereign ceiling rule, wherein the domestic bank ratings are bounded by their sovereign credit rating (Adelino and Ferreira, 2016), even when they maintain higher creditworthiness. ... The rationale for applying the rule is based on economic reasoning, particularly in relation to the need to account for capital controls and the economic stress caused by a sovereign downgrade.

Moody's and Standard & Poor's historically have applied the sovereign ceiling concept in practice fairly strictly

Oil prices have fallen to $62.49 a barrel, down about 13% since Trump’s early April tariff blitz. That price is roughly equivalent to about $45 in 2015 dollars—below the average price that sent the oil industry into a painful downturn that year.
“On an inflation-adjusted basis, current prices are at amongst the lowest they’ve ever been,” Paul McKinney, CEO of Permian driller Ring Energy, said in an interview. Prices should be around $85 a barrel to encourage companies to drill, he said.