What TA signals led to the 50% Sell on March 31?

FEMA has denied North Carolina’s request to continue matching 100% of the state’s spending on Hurricane Helene recovery.
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The agency’s decision means that North Carolina will lose a critical share of federal assistance in what’s expected to be a years-long rebuild process.
After Helene struck in late September, the Biden administration gave the green light for FEMA to reimburse North Carolina on 100% of disaster relief assistance — particularly with debris removal and emergency protective services. The cost-share allowed state officials to plow ahead on time-sensitive needs more quickly.
In December, FEMA also set the federal cost-share for all other categories of assistance at 90%. But the 100% period for debris cleanup and other services was set to end after six months.

FEMA assistance is not the same as insurance. Assistance only provides the basic needs for a home to be safe, sanitary and livable. ... FEMA assistance will allow you to make basic home repairs. Expenses for repairs that exceed the conditions to make a home safe, sanitary and livable are ineligible.

The Trump administration is proposing deep cuts at the National Oceanic and Atmospheric Administration, according to a draft budget proposal viewed by NPR. The agency's budget for 2026 would be slashed by more than 25% overall from its current level of roughly $6 billion under the proposal, which would need to be approved by Congress. The draft cuts to NOAA's research operations and fisheries services are particularly severe.
If enacted, the cuts would "take us back to the 1950s in terms of our scientific footing and the American people," says Craig McLean, a former director of NOAA's office of Oceanic and Atmospheric Research (OAR), the agency's research arm, whose career spanned multiple administrations. The budget aims to eliminate OAR, cutting the budget by close to 75% from previous levels and slashing all funding for research that focuses on climate and weather. A few groups from the office, like a team that works on tornado science, would be moved to other parts of the organization. The budget would also end funding for the many cooperative research centers scattered across the country that contribute to climate and weather research. The proposed budget comes as the administration has already fired hundreds of NOAA employees.
The cuts to the research wing, OAR, says former NOAA Deputy Undersecretary Mary Glackin, who served over several administrations, would "decimate the laboratory systems and the relationship that we have with universities," who work in partnership with the agency on many of its climate, weather, and other research projects.
It also proposes slashing the operations and personnel budget of the National Marine Fisheries Service, which manages the country's ocean fisheries, by nearly 30%, and moving the rest of the office into the U.S. Fish and Wildlife Service — another agency entirely. It also asks for the Fisheries Service staff still with the agency to prioritize ways within its purview to "unleash American energy."
The proposal also aims to slim down NOAA's investment in some of its premier satellite technology, called geostationary satellites, by 44% compared to current levels. The agency currently has five in orbit, which provide much of the data critical for weather forecasts, as well as weather and climate research and coastal security. The agency was in the process of developing the next generation of its satellites, which would have included several new instruments; the next was scheduled to go into orbit in 2032. The cuts to the program will jeopardize that plan and hamper the progression of key science, according to NOAA officials familiar with the program who were not authorized to speak publicly.
The budget for the National Weather Service would remain intact.
Project 2025 provided a preview: Many of the proposed changes echo concepts outlined in Project 2025, the conservative policy blueprint organized by the Washington, DC-based Heritage Foundation think tank, a document the Trump administration has followed closely in recent months.
Project 2025 calls for NOAA to "be broken up and downsized," keeping the pieces that many Americans are familiar with, like the National Weather Service, and dismantling many of NOAA's other offices. The proposed moves follow that rubric, such as shifting the Fisheries Service to another agency.
It also called the agency part of "the main drivers of the climate change alarm industry" and laid out ways NOAA's climate science research could be curtailed, some of which have been proposed in the budget document. Decades of research by thousands of scientists in the U.S. and internationally, have linked rising atmospheric carbon dioxide with a warming Earth. Human activities, like burning coal, gas and other fossil fuels, are the primary cause of rising greenhouse gas concentrations in the atmosphere.
NOAA provides much of the raw data required for weather forecasts via a wide array of data-collection tools, from satellites to ocean buoys to weather balloons. And its scientists run models that turn that data into useful information, like those short-term weather forecasts, seasonal outlooks and long-term looks at how climate change is affecting Earth.
The agency also includes offices that manage the billions of dollars of U.S. fishery resources, like tuna, cod, scallops and crab. Its scientists figure out how many fish can be caught in order to sustain fish populations in the long term, a task legally required by law. Interruptions to fisheries operations have resulted in the past in delays in season opening or lower annual quotas fishermen are allowed to catch.
The agency also maintains coastal maps critical to safe maritime activities.

”Please limit comments to how tariffs may impact the economy or investing.
This thread is not intended for political diatribes - please use Off Topic for that.”

I'm looking for tips on how to invest during a trade war. This isn't your average cyclical market bummer, or a black swan like COVID. I'm not saying it's different this time. But I wasn't around for Smoot-Hawley, the McKinley Tariff, or The Tariff of Abominations. I suspect people were stuffing their mattresses with bills and burying specie in the back yard. If Tariff Theater goes on long enough, I think the question will become what it will take to get people back in the market.

The sudden loss of confidence has been stark in the US Treasury market, widely considered to be the most important in the world because investors normally use it as the “risk free” benchmark to determine the price of every other financial asset.
In the sharpest weekly move since 1982, the yield – in effect the interest rate – on 30-year US government bonds rose from about 4.4% to 4.8%. The yield on 10-year bonds has also risen.